slide 1 / 225 -...
TRANSCRIPT
![Page 3: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/3.jpg)
Slide 3 / 225
Table of Contents click on the topic to go to that section
- Subtracting Ten on a Number Grid- Subtracting Ten Patterns
- Patterns When Subtracting Multiples of Ten
- Two Digit Minus One Digit
- Subtracting Ten from Multiples of Ten in Our Head
- Two Digit Minus Two Digit- Two Digit Minus Two Digit Pt. 2
- Word Problems
- Subtracting Ten from Multiples of Ten with Blocks
- Subtracting Multiples of Ten with Blocks
- Subtracting Ten with Blocks
- Subtracting Multiples of Ten on a Number Grid
- Extra Word Problems (If needed)
- Lab: Subtraction Dice Roll
- Lab: Subtraction Spin
- Lab: Subtraction Around the Room
![Page 4: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/4.jpg)
Slide 4 / 225
Standards for Mathematical Practices
MP 8 Look for and express regularity in repeated reasoning.
MP 1 Make sense of problems and persevere in solving them.
MP 2 Reason abstractly and quantitatively.
MP 3 Construct viable arguments and critique the reasoning of others.
MP 4 Model with mathematics.
MP 5 Use appropriate tools strategically.
MP 6 Attend to precision.
MP 7 Look for and make use of structure.
Click on each standard to bring you to an example of how to meet
this standard within the unit.
![Page 5: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/5.jpg)
Slide 5 / 225
Subtracting 10 from Multiples of 10 with Blocks
Click to return to Table of Contents
![Page 6: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/6.jpg)
Slide 5 (Answer) / 225
Subtracting 10 from Multiples of 10 with Blocks
Click to return to Table of Contents
Teac
her N
otes
[This object is a teacher notes pull tab]
Students will need base ten blocks and place value charts for this lesson.
![Page 7: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/7.jpg)
Slide 6 / 225
![Page 8: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/8.jpg)
Slide 6 (Answer) / 225
![Page 9: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/9.jpg)
Slide 7 / 225
![Page 10: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/10.jpg)
Slide 7 (Answer) / 225
![Page 11: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/11.jpg)
Slide 8 / 225
![Page 12: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/12.jpg)
Slide 8 (Answer) / 225
![Page 13: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/13.jpg)
Slide 9 / 225
![Page 14: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/14.jpg)
Slide 9 (Answer) / 225
![Page 15: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/15.jpg)
Slide 10 / 225
![Page 16: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/16.jpg)
Slide 10 (Answer) / 225
![Page 17: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/17.jpg)
Slide 11 / 225
![Page 18: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/18.jpg)
Slide 12 / 225
![Page 19: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/19.jpg)
Slide 12 (Answer) / 225
![Page 20: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/20.jpg)
Slide 13 / 225
![Page 21: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/21.jpg)
Slide 13 (Answer) / 225
![Page 22: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/22.jpg)
Slide 14 / 225
![Page 23: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/23.jpg)
Slide 14 (Answer) / 225
![Page 24: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/24.jpg)
Slide 15 / 225
![Page 25: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/25.jpg)
Slide 16 / 225
How is subtracting 6 - 1 similar to 60 - 10?
Class Discussion
![Page 26: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/26.jpg)
Slide 16 (Answer) / 225
How is subtracting 6 - 1 similar to 60 - 10?
Class Discussion
[This object is a pull tab]
Teac
her N
otes
Discuss how 6 cubes take away 1 cube make 5 cubes.
Then 6 longs take away 1 long make 5 longs. They
both have the same amount of blocks but the blocks are
worth different values.
![Page 27: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/27.jpg)
Slide 17 / 225
1 The base ten blocks show 20 - 10 = 10
True
False
![Page 28: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/28.jpg)
Slide 17 (Answer) / 225
1 The base ten blocks show 20 - 10 = 10
True
False
[This object is a pull tab]
Ans
wer
False
![Page 29: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/29.jpg)
Slide 18 / 225
2 60 - 10 = ______
A 5
B 50
C 70
![Page 30: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/30.jpg)
Slide 18 (Answer) / 225
2 60 - 10 = ______
A 5
B 50
C 70
[This object is a pull tab]
Ans
wer
A
![Page 31: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/31.jpg)
Slide 19 / 225
3 8 tens - 1 ten = ______ tens
![Page 32: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/32.jpg)
Slide 19 (Answer) / 225
3 8 tens - 1 ten = ______ tens
[This object is a pull tab]
Ans
wer
7
![Page 33: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/33.jpg)
Slide 20 / 225
4 Which block should we use to show
50 - 10 = ______
A 40
B cube
C long
![Page 34: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/34.jpg)
Slide 20 (Answer) / 225
4 Which block should we use to show
50 - 10 = ______
A 40
B cube
C long[This object is a pull tab]
Ans
wer
C
![Page 35: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/35.jpg)
Slide 21 / 225
![Page 36: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/36.jpg)
Slide 21 (Answer) / 225
![Page 37: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/37.jpg)
Slide 22 / 225
![Page 38: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/38.jpg)
Slide 23 / 225
![Page 39: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/39.jpg)
Slide 24 / 225
Subtracting Ten From Multiples of Ten in Our Heads
Click to return to Table of Contents
![Page 40: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/40.jpg)
Slide 25 / 225
10 20 30 40 50
60 70 80 90 100
100, ____, ____, ____, ____, ____, ____, ____, ____, ____
Let's Count By Tens
Now let's write them backwards starting with 100!
![Page 41: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/41.jpg)
Slide 25 (Answer) / 225
10 20 30 40 50
60 70 80 90 100
100, ____, ____, ____, ____, ____, ____, ____, ____, ____
Let's Count By Tens
Now let's write them backwards starting with 100!
[This object is a pull tab]
Teac
her N
otes Click on each long to make it
disappear and reveal the number. Take lots of time
during this lesson to practice counting backwards by 10.
![Page 42: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/42.jpg)
Slide 26 / 225
Let's Count Back By Tens. Start 100!
100 90 80 70 60
50 40 30 20 10
Now let's write them forwards starting with 10!
10, ______, ______, ______, ______,
______, ______, ______, ______, ______
![Page 43: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/43.jpg)
Slide 26 (Answer) / 225
Let's Count Back By Tens. Start 100!
100 90 80 70 60
50 40 30 20 10
Now let's write them forwards starting with 10!
10, ______, ______, ______, ______,
______, ______, ______, ______, ______
Teac
her N
otes
[This object is a teacher notes pull tab]
Click on each dime to make the number appear.
![Page 44: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/44.jpg)
Slide 27 / 225
100, 90, 80, 70, 60, 50, 40, 30, 20, 10What pattern do you see
when counting backwards?
100, 90, 80, 70, 60, 50, 40, 30, 20, 10
Patterns when Counting
![Page 45: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/45.jpg)
Slide 27 (Answer) / 225
100, 90, 80, 70, 60, 50, 40, 30, 20, 10What pattern do you see
when counting backwards?
100, 90, 80, 70, 60, 50, 40, 30, 20, 10
Patterns when Counting
[This object is a pull tab]
Teac
her N
otes
&
Mat
h Pr
actic
e
MP 7 Look for and make use of structure
Ask students to identify the pattern they see and how they
think the pattern could help them.
Click on the question to show the numbers with the pattern
highlighted.
![Page 46: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/46.jpg)
Slide 28 / 225
Practice
50, 40, 30, ______, ______
90, 80, 70, ______, ______
80, 70, 60, ______, ______
100, 90, 80, ______, ______
60, 50, 40, ______, ______
![Page 47: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/47.jpg)
Slide 29 / 225
When subtracting ten,
the tens place goes down by 1.
50 - 10 = 40
70 - 10 = 60
Subtracting
![Page 48: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/48.jpg)
Slide 29 (Answer) / 225
When subtracting ten,
the tens place goes down by 1.
50 - 10 = 40
70 - 10 = 60
Subtracting
Teac
her N
otes
[This object is a teacher notes pull tab]
Discuss how 5 went down to 4 which is 1 less and how 7 went down to 6 which is one
less.
![Page 49: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/49.jpg)
Slide 30 / 225
Practice
80 - 10 = ______
![Page 50: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/50.jpg)
Slide 31 / 225
Practice
40 - 10 = ______
![Page 51: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/51.jpg)
Slide 32 / 225
60 - 10 = ______
Practice
![Page 52: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/52.jpg)
Slide 33 / 225
6 30 - 10 = ______
A 40
B 20
C 30
![Page 53: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/53.jpg)
Slide 33 (Answer) / 225
6 30 - 10 = ______
A 40
B 20
C 30
[This object is a pull tab]
Ans
wer
B
![Page 54: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/54.jpg)
Slide 34 / 225
7 10 - 10 = ______
A 20
B 0
C 10
![Page 55: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/55.jpg)
Slide 34 (Answer) / 225
7 10 - 10 = ______
A 20
B 0
C 10
[This object is a pull tab]
Ans
wer
B
![Page 56: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/56.jpg)
Slide 35 / 225
8 70 - 10 = ______
A 60
B 80
C 10
![Page 57: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/57.jpg)
Slide 35 (Answer) / 225
8 70 - 10 = ______
A 60
B 80
C 10
[This object is a pull tab]
Ans
wer
A
![Page 58: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/58.jpg)
Slide 36 / 225
9 90 - 10 =
![Page 59: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/59.jpg)
Slide 36 (Answer) / 225
9 90 - 10 =
[This object is a pull tab]
Ans
wer
80
![Page 60: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/60.jpg)
Slide 37 / 225
10 20 - 10 =
![Page 61: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/61.jpg)
Slide 37 (Answer) / 225
10 20 - 10 =
[This object is a pull tab]
Ans
wer
10
![Page 62: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/62.jpg)
Slide 38 / 225
![Page 63: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/63.jpg)
Slide 39 / 225
![Page 65: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/65.jpg)
Slide 40 (Answer) / 225
Subtracting 10 with Blocks
Click to return to Table of Contents
Teac
her N
otes
[This object is a teacher notes pull tab]
Students will need base ten blocks and place value charts for this lesson.
![Page 66: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/66.jpg)
Slide 41 / 225
![Page 67: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/67.jpg)
Slide 41 (Answer) / 225
![Page 68: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/68.jpg)
Slide 42 / 225
![Page 69: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/69.jpg)
Slide 42 (Answer) / 225
![Page 70: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/70.jpg)
Slide 43 / 225
![Page 71: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/71.jpg)
Slide 43 (Answer) / 225
![Page 72: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/72.jpg)
Slide 44 / 225
![Page 73: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/73.jpg)
Slide 44 (Answer) / 225
![Page 74: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/74.jpg)
Slide 45 / 225
![Page 75: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/75.jpg)
Slide 45 (Answer) / 225
![Page 76: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/76.jpg)
Slide 46 / 225
![Page 77: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/77.jpg)
Slide 46 (Answer) / 225
![Page 78: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/78.jpg)
Slide 47 / 225
![Page 79: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/79.jpg)
Slide 47 (Answer) / 225
![Page 80: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/80.jpg)
Slide 48 / 225
11 34 - 10 = 24
Yes
No
** Use blocks at your desk to help you **
![Page 81: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/81.jpg)
Slide 48 (Answer) / 225
11 34 - 10 = 24
Yes
No
** Use blocks at your desk to help you **[This object is a pull tab]
Ans
wer
Yes
![Page 82: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/82.jpg)
Slide 49 / 225
![Page 83: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/83.jpg)
Slide 49 (Answer) / 225
![Page 84: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/84.jpg)
Slide 50 / 225
![Page 85: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/85.jpg)
Slide 50 (Answer) / 225
![Page 86: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/86.jpg)
Slide 51 / 225
![Page 87: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/87.jpg)
Slide 51 (Answer) / 225
![Page 88: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/88.jpg)
Slide 52 / 225
15 82 - 10 = ______
** Use blocks at your desk to help you **
![Page 89: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/89.jpg)
Slide 52 (Answer) / 225
15 82 - 10 = ______
** Use blocks at your desk to help you **
[This object is a pull tab]
Ans
wer
72
![Page 90: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/90.jpg)
Slide 53 / 225
![Page 91: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/91.jpg)
Slide 54 / 225
![Page 93: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/93.jpg)
Slide 55 (Answer) / 225
Subtracting Ten on a Number Grid
Click to return to Table of Contents
Teac
her N
otes
[This object is a teacher notes pull tab]
Before starting this lesson, review
multiples of 10 with the students by
counting by 10 and listing multiples of
10 on the board. All students will need a
number grid.
![Page 94: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/94.jpg)
Slide 56 / 225
Subtracting 10 is very easy when using a number grid.Find the number you are subtracting 10 from on the number
grid and circle it. Then move up one box.
Number Grid
![Page 95: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/95.jpg)
Slide 57 / 225
24 - 10 = 14
![Page 96: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/96.jpg)
Slide 57 (Answer) / 225
24 - 10 = 14
Teac
her N
otes
[This object is a teacher notes pull tab]
Discuss why 24 is circled. Allow students to count the boxes one jump at a time to confirm that one jump up is
that same as ten jumps.
![Page 97: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/97.jpg)
Slide 58 / 225
40 - 10 = 30
Find the first number on the number grid.Since we are subtracting from a multiple of 10, the
number will always be in the last row.Then, move up one jump.
![Page 98: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/98.jpg)
Slide 59 / 225
Let's try another one56 - 10 =
First, find the number on the number grid.Then jump up one.
![Page 99: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/99.jpg)
Slide 60 / 225
Let's try another one34 - 10 =
What number should we circle?
![Page 100: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/100.jpg)
Slide 61 / 225
Let's try another one63 - 10 =
What number should we circle?
![Page 101: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/101.jpg)
Slide 62 / 225
Let's try another one19 - 10 =
![Page 102: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/102.jpg)
Slide 63 / 225
Let's try another one80 - 10 =
![Page 103: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/103.jpg)
Slide 64 / 225
Class Discussion
John used his number grid to help solve the subtraction sentence below. He said the answer is
25. Is he correct? What did he do wrong?
24 - 10 =
![Page 104: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/104.jpg)
Slide 64 (Answer) / 225
Class Discussion
John used his number grid to help solve the subtraction sentence below. He said the answer is
25. Is he correct? What did he do wrong?
24 - 10 =
[This object is a pull tab]
Mat
h Pr
actic
e
MP 3 Construct viable arguments and critique the
reasoning of others
In small groups give students time to voice their opinions about the problems. Then
allow a whole class discussion on why he is or is not correct.
![Page 105: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/105.jpg)
Slide 65 / 225
16 25 - 10 = 24
Yes
No
![Page 106: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/106.jpg)
Slide 65 (Answer) / 225
16 25 - 10 = 24
Yes
No
[This object is a pull tab]
Ans
wer
No
![Page 107: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/107.jpg)
Slide 66 / 225
17 39 - 10 = 49
True
False
![Page 108: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/108.jpg)
Slide 66 (Answer) / 225
17 39 - 10 = 49
True
False
[This object is a pull tab]
Ans
wer
False
![Page 109: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/109.jpg)
Slide 67 / 225
18 58 - 10 = ______
A 68
B 48
C 58
![Page 110: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/110.jpg)
Slide 67 (Answer) / 225
18 58 - 10 = ______
A 68
B 48
C 58
[This object is a pull tab]
Ans
wer
B
![Page 111: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/111.jpg)
Slide 68 / 225
19 34 - 10 =
![Page 112: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/112.jpg)
Slide 68 (Answer) / 225
19 34 - 10 =
[This object is a pull tab]
Ans
wer
24
![Page 113: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/113.jpg)
Slide 69 / 225
20 74 - 10 =
![Page 114: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/114.jpg)
Slide 69 (Answer) / 225
20 74 - 10 =
[This object is a pull tab]
Ans
wer
64
![Page 115: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/115.jpg)
Slide 70 / 225
![Page 116: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/116.jpg)
Slide 71 / 225
![Page 118: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/118.jpg)
Slide 73 / 225
46- 10 36
When subtracting 10,the tens place always goes down 1 and the ones place
stays the same.
Tens
One
s
![Page 119: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/119.jpg)
Slide 74 / 225
24- 10 14
39- 10 29
77- 10 67
62- 10 52
![Page 120: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/120.jpg)
Slide 74 (Answer) / 225
24- 10 14
39- 10 29
77- 10 67
62- 10 52
Teac
her N
otes
[This object is a teacher notes pull tab]
Discuss the pattern in the tens place.
![Page 121: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/121.jpg)
Slide 75 / 225
6 4- 1 0
5 6- 1 0
3 7- 1 0
2 3- 1 0
![Page 122: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/122.jpg)
Slide 76 / 225
Let's Practice
65 - 10 = _____
85 - 10 = _____
38 - 10 = _____
61 - 10 = _____
![Page 123: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/123.jpg)
Slide 76 (Answer) / 225
Let's Practice
65 - 10 = _____
85 - 10 = _____
38 - 10 = _____
61 - 10 = _____[This object is a pull tab]
Mat
h Pr
actic
e
MP 8 Look for and express regularity in repeated reasoning
Ask students if they can find a shortcut to solve these
problems and how it would make it easier.
![Page 124: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/124.jpg)
Slide 77 / 225
Web Practice
Click here for a game. Select level 3
![Page 125: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/125.jpg)
Slide 78 / 225
21 59 - 10 = 69
True
False
![Page 126: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/126.jpg)
Slide 78 (Answer) / 225
21 59 - 10 = 69
True
False
[This object is a pull tab]
Ans
wer
False
![Page 127: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/127.jpg)
Slide 79 / 225
22 67 - 10 = ______
A 57
B 77
C 66
![Page 128: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/128.jpg)
Slide 79 (Answer) / 225
22 67 - 10 = ______
A 57
B 77
C 66
[This object is a pull tab]
Ans
wer
A
![Page 129: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/129.jpg)
Slide 80 / 225
23 31 - 10 = ______
A 41
B 21
C 30
![Page 130: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/130.jpg)
Slide 80 (Answer) / 225
23 31 - 10 = ______
A 41
B 21
C 30
[This object is a pull tab]
Ans
wer
B
![Page 131: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/131.jpg)
Slide 81 / 225
24 45 - 10 =
![Page 132: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/132.jpg)
Slide 81 (Answer) / 225
24 45 - 10 =
[This object is a pull tab]
Ans
wer
35
![Page 133: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/133.jpg)
Slide 82 / 225
25 32 - 10 =
![Page 134: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/134.jpg)
Slide 82 (Answer) / 225
25 32 - 10 =
[This object is a pull tab]
Ans
wer
22
![Page 135: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/135.jpg)
Slide 83 / 225
![Page 136: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/136.jpg)
Slide 84 / 225
![Page 137: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/137.jpg)
Slide 85 / 225
Subtracting Multiples of 10with Blocks
Click to return to Table of Contents
![Page 138: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/138.jpg)
Slide 85 (Answer) / 225
Subtracting Multiples of 10with Blocks
Click to return to Table of Contents
Teac
her N
otes
[This object is a teacher notes pull tab]
Students will need base ten blocks and place value charts for this lesson.
![Page 139: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/139.jpg)
Slide 86 / 225
![Page 140: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/140.jpg)
Slide 86 (Answer) / 225
![Page 141: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/141.jpg)
Slide 87 / 225
![Page 142: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/142.jpg)
Slide 87 (Answer) / 225
![Page 143: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/143.jpg)
Slide 88 / 225
![Page 144: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/144.jpg)
Slide 89 / 225
![Page 145: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/145.jpg)
Slide 90 / 225
![Page 146: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/146.jpg)
Slide 90 (Answer) / 225
![Page 147: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/147.jpg)
Slide 91 / 225
![Page 148: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/148.jpg)
Slide 91 (Answer) / 225
![Page 149: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/149.jpg)
Slide 92 / 225
26 Does 40 - 20 = 10?
Yes
No
** Use your blocks to help you **
![Page 150: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/150.jpg)
Slide 92 (Answer) / 225
26 Does 40 - 20 = 10?
Yes
No
** Use your blocks to help you **
[This object is a pull tab]
Ans
wer
No
![Page 151: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/151.jpg)
Slide 93 / 225
27 80 - 70 = 10
True
False
** Use your blocks to help you **
![Page 152: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/152.jpg)
Slide 93 (Answer) / 225
27 80 - 70 = 10
True
False
** Use your blocks to help you **[This object is a pull tab]
Ans
wer
True
![Page 153: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/153.jpg)
Slide 94 / 225
28 40 - 30 = ______
A 20
B 70
C 10
** Use your blocks to help you **
![Page 154: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/154.jpg)
Slide 94 (Answer) / 225
28 40 - 30 = ______
A 20
B 70
C 10
** Use your blocks to help you **
[This object is a pull tab]
Ans
wer
C
![Page 155: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/155.jpg)
Slide 95 / 225
29 90 - 60 = ______
** Use your blocks to help you **
![Page 156: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/156.jpg)
Slide 95 (Answer) / 225
29 90 - 60 = ______
** Use your blocks to help you **[This object is a pull tab]
Ans
wer
30
![Page 157: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/157.jpg)
Slide 96 / 225
30 50 - 50 = ______
** Use your blocks to help you **
![Page 158: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/158.jpg)
Slide 96 (Answer) / 225
30 50 - 50 = ______
** Use your blocks to help you **[This object is a pull tab]
Ans
wer
0
![Page 159: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/159.jpg)
Slide 97 / 225
![Page 160: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/160.jpg)
Slide 98 / 225
![Page 161: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/161.jpg)
Slide 99 / 225
Subtracting Multiples of Ten on a Number Grid
Click to return to Table of Contents
![Page 162: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/162.jpg)
Slide 99 (Answer) / 225
Subtracting Multiples of Ten on a Number Grid
Click to return to Table of Contents
Teac
her N
otes
[This object is a teacher notes pull tab]
Before starting this lesson, review
multiples of 10 with the students by
counting by 10 and listing multiples of 10
on the board.
![Page 163: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/163.jpg)
Slide 100 / 225
Let's warm up our brains by skip counting by 10's
using different voices.
Can you count by 10s in a:
- scary voice?
- mommy voice?
- baby voice?
- daddy voice?
10, 20, 30
Count by 10's
![Page 164: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/164.jpg)
Slide 101 / 225
To subtract multiples of 10 on a number grid, you count by 10s.
60 - 40 = ______Find the first number on the grid and circle it.
Count by 10s and move up one jump for each number you say. Stop when you say the second number in the subtraction
sentence. The number you land on is the answer.
10203040
Subtract
![Page 165: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/165.jpg)
Slide 102 / 225
Count by 10 as you move up to solve the subtraction sentence.
80 - 20 = ______What number should you circle?
Subtract
![Page 166: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/166.jpg)
Slide 102 (Answer) / 225
Count by 10 as you move up to solve the subtraction sentence.
80 - 20 = ______What number should you circle?
Subtract
Teac
her N
otes
[This object is a teacher notes pull tab]
Have students work through these problems at
their seats as another student demonstrates it on the board.
![Page 167: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/167.jpg)
Slide 103 / 225
Count by 10 as you move up to solve the subtraction sentence.
30 - 10 = ______What number should you circle?
Subtract
![Page 168: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/168.jpg)
Slide 104 / 225
Count by 10 as you move up to solve the subtraction sentence.
70 - 50 = ______What number should you circle?
Subtract
![Page 169: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/169.jpg)
Slide 105 / 225
90 - 20 = ______
Subtract
![Page 170: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/170.jpg)
Slide 106 / 225
50 - 40 = ______
Subtract
![Page 171: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/171.jpg)
Slide 106 (Answer) / 225
50 - 40 = ______
Subtract
[This object is a pull tab]
Mat
h Pr
actic
e
MP 5 Use appropriate tools strategically
Have students verbally explain to a partner how they
would use the grid to help them solve the problem.
Have a student then explain each step as they solve the
problem at the board.
![Page 172: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/172.jpg)
Slide 107 / 225
31 60 - 20 = ______
A 80
B 50
C 40
** Use your number grid to help you **
![Page 173: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/173.jpg)
Slide 107 (Answer) / 225
31 60 - 20 = ______
A 80
B 50
C 40
** Use your number grid to help you **
[This object is a pull tab]
Ans
wer
C
![Page 174: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/174.jpg)
Slide 108 / 225
32 When subtracting multiples of 10, we need to count by ______.
A 1
B 5
C 10
![Page 175: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/175.jpg)
Slide 108 (Answer) / 225
32 When subtracting multiples of 10, we need to count by ______.
A 1
B 5
C 10
[This object is a pull tab]
Ans
wer
C
![Page 176: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/176.jpg)
Slide 109 / 225
33 90 - 40 = ______
A 40
B 50
C 60
** Use your number grid to help you **
![Page 177: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/177.jpg)
Slide 109 (Answer) / 225
33 90 - 40 = ______
A 40
B 50
C 60
** Use your number grid to help you **[This object is a pull tab]
Ans
wer
B
![Page 178: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/178.jpg)
Slide 110 / 225
34 50 - 30 = ______
** Use your number grid to help you **
![Page 179: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/179.jpg)
Slide 110 (Answer) / 225
34 50 - 30 = ______
** Use your number grid to help you **[This object is a pull tab]
Ans
wer
20
![Page 180: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/180.jpg)
Slide 111 / 225
35 20 - 10 = ______
** Use your number grid to help you **
![Page 181: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/181.jpg)
Slide 111 (Answer) / 225
35 20 - 10 = ______
** Use your number grid to help you **[This object is a pull tab]
Ans
wer
10
![Page 182: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/182.jpg)
Slide 112 / 225
![Page 183: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/183.jpg)
Slide 113 / 225
![Page 184: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/184.jpg)
Slide 114 / 225
Patterns When SubtractingMultiples of Ten
Click to return to Table of Contents
![Page 185: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/185.jpg)
Slide 115 / 225
Let's Count By 10s
What digit changes when we count by 10s?
![Page 186: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/186.jpg)
Slide 115 (Answer) / 225
Let's Count By 10s
What digit changes when we count by 10s?
Teac
her N
otes
[This object is a teacher notes pull tab]
Write the numbers on the lines.
![Page 187: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/187.jpg)
Slide 116 / 225
What number is this?
Take 20 away and what number does it become?
What digit changed?
![Page 188: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/188.jpg)
Slide 116 (Answer) / 225
What number is this?
Take 20 away and what number does it become?
What digit changed?
Teac
her N
otes
[This object is a teacher notes pull tab]
Cross out 2 longs and have the students recount.
Discuss how the tens place changed but not the ones since we subtracted 10s.
![Page 189: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/189.jpg)
Slide 117 / 225
30 - 20 = 10
![Page 190: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/190.jpg)
Slide 117 (Answer) / 225
30 - 20 = 10Te
ache
r Not
es
[This object is a teacher notes pull tab]
Review how the tens place changed when we subtracted
10.
![Page 191: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/191.jpg)
Slide 118 / 225
What number is this?
What digit changed?
Take 40 away and what number does it become?
![Page 192: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/192.jpg)
Slide 119 / 225
What number is this?
What digit changed?
Take ten away and what number does it become?
![Page 193: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/193.jpg)
Slide 120 / 225
Count back by 10s
60, 50, ___, ___, ___, ___
70, 60, ___, ___, ___, ___
40, 30, ___, ___, ___, ___
60, 50, ___, ___, ___, ___
![Page 194: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/194.jpg)
Slide 120 (Answer) / 225
Count back by 10s
60, 50, ___, ___, ___, ___
70, 60, ___, ___, ___, ___
40, 30, ___, ___, ___, ___
60, 50, ___, ___, ___, ___
Teac
her N
otes
[This object is a teacher notes pull tab]
Review that when counting by 10s, the tens place goes down 1 and the ones place
stays the same.
![Page 195: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/195.jpg)
Slide 121 / 225
40
206030
8070
What number is 20 less?
![Page 196: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/196.jpg)
Slide 122 / 225
36 10 less than 50 is 5?
True
False
![Page 197: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/197.jpg)
Slide 122 (Answer) / 225
36 10 less than 50 is 5?
True
False
[This object is a pull tab]
Ans
wer
False
![Page 198: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/198.jpg)
Slide 123 / 225
37 20 less than 90 is 80?
Yes
No
![Page 199: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/199.jpg)
Slide 123 (Answer) / 225
37 20 less than 90 is 80?
Yes
No
[This object is a pull tab]
Ans
wer
No
![Page 200: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/200.jpg)
Slide 124 / 225
38 What is 30 less than 40?
![Page 201: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/201.jpg)
Slide 124 (Answer) / 225
38 What is 30 less than 40?
[This object is a pull tab]
Ans
wer
10
![Page 202: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/202.jpg)
Slide 125 / 225
39 What is 40 less than 50?
![Page 203: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/203.jpg)
Slide 125 (Answer) / 225
39 What is 40 less than 50?
[This object is a pull tab]
Ans
wer
10
![Page 204: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/204.jpg)
Slide 126 / 225
40 70 - 40 = ?
QUIZ
![Page 205: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/205.jpg)
Slide 126 (Answer) / 225
40 70 - 40 = ?
QUIZ
[This object is a pull tab]
Ans
wer
30
![Page 206: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/206.jpg)
Slide 127 / 225
Lab: Subtracting 10 Dice Roll
Directions:· Split students into groups of 2 and give each group 2 dice· Each student rolls 1 dice and they work together to build the largest two digit number with their dice· Students write the number in the box on their worksheet· Students subtract 10 and write the answer on the line
Click to return to Table of Contents
Click here for more information.
![Page 207: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/207.jpg)
Slide 128 / 225
![Page 208: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/208.jpg)
Slide 129 / 225
![Page 210: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/210.jpg)
Slide 131 / 225
When subtracting a 1 digit number from a 2 digit number, it is very important to line them up on top of
each other.
36 - 2
All of the numbers should be on the right
Subtracting
![Page 211: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/211.jpg)
Slide 131 (Answer) / 225
When subtracting a 1 digit number from a 2 digit number, it is very important to line them up on top of
each other.
36 - 2
All of the numbers should be on the right
Subtracting
Teac
her N
otes
[This object is a teacher notes pull tab]
You may need to review digits vs numbers with the
kids prior to this lesson. In addition, review place value.
![Page 212: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/212.jpg)
Slide 132 / 225
Can you line up these numbers?
24- 4
Subtracting
![Page 213: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/213.jpg)
Slide 133 / 225
Can you line up these numbers?
58- 6
Subtracting
![Page 214: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/214.jpg)
Slide 134 / 225
Can you line up these numbers?
73- 1
Subtracting
![Page 215: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/215.jpg)
Slide 134 (Answer) / 225
Can you line up these numbers?
73- 1
Subtracting
[This object is a pull tab]
Mat
h Pr
actic
e
MP 6 Attend to precision
Ask students what would happen if they don't line the
numbers up correctly.
![Page 216: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/216.jpg)
Slide 135 / 225
Once the numbers are lined up,subtract the ones first and then the tens.
2 7- 4
One
s
It may help you to draw a line between the tens and ones.
3
When there is no digit in the tens
place, we know it is a 0. 0
2It is important to line up
the answer as well!!
Subtracting
![Page 217: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/217.jpg)
Slide 136 / 225
Remember to subtract the ones first and then the tens!!!
5 3- 1
One
s
It may help you to draw a line between the tens and ones.
When there is no digit in the tens place, we know it is a 0. 0
It is important to line up the answer as well!!
Subtracting
![Page 218: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/218.jpg)
Slide 137 / 225
Remember to subtract the ones first and then the tens!!!
79- 8
One
s
It may help you to draw a line between the tens and ones.
It is important to line up the answer as well!!
Subtracting
![Page 219: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/219.jpg)
Slide 138 / 225
Remember to subtract the ones first and then the tens!!!
65- 3
One
s
It may help you to draw a line between the tens and ones.
It is important to line up the answer as
well!!
Subtracting
![Page 220: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/220.jpg)
Slide 139 / 225
Remember to subtract the ones first and then the tens!!!
9 6- 5
Subtract
![Page 221: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/221.jpg)
Slide 140 / 225
Remember to subtract the ones first and then the tens!!!
3 5- 3
Subtract
![Page 222: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/222.jpg)
Slide 141 / 225
Remember to subtract the ones first and then the tens!!!
2 6- 2
Subtract
![Page 223: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/223.jpg)
Slide 141 (Answer) / 225
Remember to subtract the ones first and then the tens!!!
2 6- 2
Subtract
[This object is a pull tab]
Mat
h Pr
actic
e
MP 2 Reason abstractly and quantitatively
Ask students if the answer is going to be more than or less than 26. Have them explain
their reasoning.
![Page 224: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/224.jpg)
Slide 142 / 225
Web Practice
Click here for a game. Select level 4
![Page 225: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/225.jpg)
Slide 143 / 225
41 3 9 - 7
A 32
B 31
C 36
![Page 226: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/226.jpg)
Slide 143 (Answer) / 225
41 3 9 - 7
A 32
B 31
C 36 [This object is a pull tab]
Ans
wer
A
![Page 227: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/227.jpg)
Slide 144 / 225
42 1 4 - 3
A 17
B 7
C 11
![Page 228: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/228.jpg)
Slide 144 (Answer) / 225
42 1 4 - 3
A 17
B 7
C 11[This object is a pull tab]
Ans
wer
C
![Page 229: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/229.jpg)
Slide 145 / 225
43 7 7 - 5
![Page 230: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/230.jpg)
Slide 145 (Answer) / 225
43 7 7 - 5
[This object is a pull tab]
Ans
wer
72
![Page 231: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/231.jpg)
Slide 146 / 225
44 8 4 - 3
![Page 232: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/232.jpg)
Slide 146 (Answer) / 225
44 8 4 - 3
[This object is a pull tab]
Ans
wer
81
![Page 233: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/233.jpg)
Slide 147 / 225
45 2 7 - 2
![Page 234: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/234.jpg)
Slide 147 (Answer) / 225
45 2 7 - 2
[This object is a pull tab]
Ans
wer
25
![Page 235: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/235.jpg)
Slide 148 / 225
![Page 236: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/236.jpg)
Slide 149 / 225
![Page 238: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/238.jpg)
Slide 151 / 225
What number is represented below?
Two Digit Subtraction
![Page 239: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/239.jpg)
Slide 152 / 225
24
Now we want to take away 11
When we take away we always start with the bigger number.
Two Digit Subtraction
![Page 240: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/240.jpg)
Slide 153 / 225
tens ones
2 41 1-
First subtract the ones by crossing them out.
How many are left?
![Page 241: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/241.jpg)
Slide 154 / 225
Next cross out the tens
How many are left?
3
tens ones
2 41 1-
![Page 242: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/242.jpg)
Slide 155 / 225
tens ones
2 41 1-
31
Two Digit Subtraction
![Page 243: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/243.jpg)
Slide 156 / 225
What number is shown below?
Two Digit Subtraction
![Page 244: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/244.jpg)
Slide 157 / 225
47
Now we want to take away 23
Remember we always start with the bigger number.
Two Digit Subtraction
![Page 245: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/245.jpg)
Slide 158 / 225
tens ones
4 72 3-
First cross out the ones
How many are left?
![Page 246: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/246.jpg)
Slide 159 / 225
tens ones
4 72 3-
Next cross out the tens
How many are left?
4
![Page 247: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/247.jpg)
Slide 160 / 225
tens ones
4 72 3-
42
Two Digit Subtraction
![Page 248: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/248.jpg)
Slide 161 / 225
tens ones
3 4 3 1-
First cross out the ones.Next cross out the tens.What is the answer?
Subtract
![Page 249: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/249.jpg)
Slide 162 / 225
tens ones
6 8 4 7-
First cross out the ones.Next cross out the tens.What is the answer?
Subtract
![Page 250: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/250.jpg)
Slide 163 / 225
tens ones
5 2 3 2-
First cross out the ones.Next cross out the tens.What is the answer?
Subtract
![Page 251: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/251.jpg)
Slide 164 / 225
tens ones
4 9 2 7-
First cross out the ones.Next cross out the tens.What is the answer?
Subtract
![Page 252: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/252.jpg)
Slide 165 / 225
Roll the two set of dice.Place the larger number at the top of the problem.
Place the second number under the first number. Subtract.
![Page 253: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/253.jpg)
Slide 166 / 225
46 3 5 - 1 2 2 3
Yes
No
![Page 254: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/254.jpg)
Slide 166 (Answer) / 225
46 3 5 - 1 2 2 3
Yes
No[This object is a pull tab]
Ans
wer
Yes
![Page 255: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/255.jpg)
Slide 167 / 225
47 6 9 - 5 6 3 3
Yes
No
![Page 256: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/256.jpg)
Slide 167 (Answer) / 225
47 6 9 - 5 6 3 3
Yes
No [This object is a pull tab]
Ans
wer
No
![Page 257: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/257.jpg)
Slide 168 / 225
48 2 4 - 1 2
A 36
B 2
C 12
![Page 258: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/258.jpg)
Slide 168 (Answer) / 225
48 2 4 - 1 2
A 36
B 2
C 12 [This object is a pull tab]
Ans
wer
C
![Page 259: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/259.jpg)
Slide 169 / 225
Draw base ten blocks to help you solve this problem.
49 3 6 - 2 2
A 14
B 24
C 58
![Page 260: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/260.jpg)
Slide 169 (Answer) / 225
Draw base ten blocks to help you solve this problem.
49 3 6 - 2 2
A 14
B 24
C 58 [This object is a pull tab]
Ans
wer
A
![Page 261: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/261.jpg)
Slide 170 / 225
50 7 8 - 4 3
Draw base ten blocks to help you solve this problem.
![Page 262: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/262.jpg)
Slide 170 (Answer) / 225
50 7 8 - 4 3
Draw base ten blocks to help you solve this problem.
[This object is a pull tab]
Ans
wer
35
![Page 263: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/263.jpg)
Slide 171 / 225
![Page 264: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/264.jpg)
Slide 172 / 225
![Page 266: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/266.jpg)
Slide 174 / 225
34- 23
When subtracting two digit numbers, it is important to still line up the numbers.
34- 23
Subtracting Two Digit Numbers
![Page 267: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/267.jpg)
Slide 174 (Answer) / 225
34- 23
When subtracting two digit numbers, it is important to still line up the numbers.
34- 23
Subtracting Two Digit Numbers
Teac
her N
otes
[This object is a teacher notes pull tab]
Show students how the ones and tens are lined up. Also, point out where the minus
sign is. Have students practice writing the problem
on their own paper to be sure they are lining the numbers up correctly.
![Page 268: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/268.jpg)
Slide 175 / 225
3 42 3-
Once the numbers are lined up,draw a line between the tens and ones.
First subtract the ones.
Think of it as two smaller subtraction problems
One
s
Tens
Subtracting Two Digit Numbers
![Page 269: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/269.jpg)
Slide 176 / 225
3 42 3-
After you subtract the ones,subtract the tens!
One
s
Tens
11Don't forget to line up the answer too!
Subtracting Two Digit Numbers
![Page 270: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/270.jpg)
Slide 177 / 225
7 6 4 5-
Let's try one!
One
s
Tens
![Page 271: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/271.jpg)
Slide 177 (Answer) / 225
7 6 4 5-
Let's try one!
One
s
Tens
Teac
her N
otes
[This object is a teacher notes pull tab]
Have the students practice lining up the numbers by pulling
the digits to the correct location. Once the numbers are lined up, have them mark the ones by either circling the ones or drawing an arrow on
top to remind them to subtract the ones first.
![Page 272: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/272.jpg)
Slide 178 / 225
3 6 5 2-
Practice
One
s
Tens
![Page 273: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/273.jpg)
Slide 179 / 225
1 46 4 -
Practice
One
s
Tens
![Page 274: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/274.jpg)
Slide 180 / 225
5 72 1-
Practice
One
s
Tens
![Page 275: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/275.jpg)
Slide 181 / 225
6 53 3-
Practice
One
s
Tens
![Page 276: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/276.jpg)
Slide 182 / 225
7 22 0-
Practice
One
s
Tens
![Page 277: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/277.jpg)
Slide 182 (Answer) / 225
7 22 0-
Practice
One
s
Tens
[This object is a pull tab]
Mat
h Pr
actic
e
MP 1 Make sense of problems and persevere in solving them
Ask students how they would start this problem. Be sure that they line up the numbers. Have
them then talk out each step.
![Page 278: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/278.jpg)
Slide 183 / 225
Web Practice
Click here for a game. Select level 6
![Page 279: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/279.jpg)
Slide 184 / 225
51 6 8 - 3 6
A 94
B 32
C 31
![Page 280: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/280.jpg)
Slide 184 (Answer) / 225
51 6 8 - 3 6
A 94
B 32
C 31[This object is a pull tab]
Ans
wer
B
![Page 281: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/281.jpg)
Slide 185 / 225
52 3 6 - 1 5
![Page 282: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/282.jpg)
Slide 185 (Answer) / 225
52 3 6 - 1 5
[This object is a pull tab]
Ans
wer
21
![Page 283: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/283.jpg)
Slide 186 / 225
53 4 6 - 2 3
![Page 284: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/284.jpg)
Slide 186 (Answer) / 225
53 4 6 - 2 3
[This object is a pull tab]
Ans
wer
13
![Page 285: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/285.jpg)
Slide 187 / 225
54 35 - 21 =
![Page 286: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/286.jpg)
Slide 187 (Answer) / 225
54 35 - 21 =
[This object is a pull tab]
Ans
wer
14
![Page 287: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/287.jpg)
Slide 188 / 225
Lab: Subtraction Spin· Assemble spinners by cutting out the two circles and arrows. Attach the arrow to the center of the spinner with a brad.· Have students work with a partner.· Student 1 spins spinner A and write the number on the top line of the subtraction sentence. Repeat with spinner B and write the number under the first number.· Student 1 solves the subtraction sentence on the paper while student 2 uses a calculator to check the answer. If student 1 is incorrect, have the students work together to find the mistake.· Switch rolls and repeat.
Click to return to Table of Contents
Click here for a more information
![Page 288: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/288.jpg)
Slide 189 / 225
![Page 289: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/289.jpg)
Slide 190 / 225
![Page 291: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/291.jpg)
Slide 192 / 225
There are 3 different types of subtraction problems
1. Take away
2. Comparison
3. Part/Part/Whole
We solve all three by lining up the numbers on
top of each other and subtracting.
![Page 292: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/292.jpg)
Slide 193 / 225
Take Away
Take away problems ask us to find how many are left. We start with a group of objects and take some away.
There are 26 red birds on a fence and 14 fly away.
How many are left?
26 - 14 = ?
xxxxxx xxxxx xxx
![Page 293: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/293.jpg)
Slide 194 / 225
Part/Part/Whole
In part/part/whole problems,
we are looking for the missing part.
Jim has 43 Skittles.
12 of them are red.
How many are not red?
Whole
Part Part
4312 ?43 - 12 = ?
![Page 294: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/294.jpg)
Slide 195 / 225
Comparison
Comparison problems ask us to find the difference between two amounts.
How many more? How many less? How much bigger? How much smaller?
Jim has 45 pencils. Jess has 67 pencils. How many more pencils does Jess have?
67 - 45 = ?
![Page 295: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/295.jpg)
Slide 196 / 225
Sometimes subtraction word problems require multiple steps.It is helpful to underline the 2 parts in different colors.
Joe went to the store and bought 12 bananas and 21 apples. His sister ate 10 pieces of fruit. How
many apples and bananas are left?
Word Problems
![Page 296: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/296.jpg)
Slide 197 / 225
Joe went to the store and bought 12 bananas and 21 apples. His sister ate 10 pieces of fruit. How
many apples and bananas are left?
Step 1: How many pieces of fruit did Joe buy in all?
12 + 21 = ______?
In order to find how many are left, we need to first find out how many he started with.
Word Problem
![Page 297: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/297.jpg)
Slide 197 (Answer) / 225
Joe went to the store and bought 12 bananas and 21 apples. His sister ate 10 pieces of fruit. How
many apples and bananas are left?
Step 1: How many pieces of fruit did Joe buy in all?
12 + 21 = ______?
In order to find how many are left, we need to first find out how many he started with.
Word Problem
Teac
her N
otes
[This object is a teacher notes pull tab]
Click on the ? to show the addition problem.
![Page 298: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/298.jpg)
Slide 198 / 225
Joe went to the store and bought 12 bananas and 21 apples. His sister ate 10 pieces of fruit. How many
apples and bananas are left?
Step 2: How many pieces are left after his sister ate some?
33 - 10 = ______?
Word Problem
![Page 299: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/299.jpg)
Slide 199 / 225
What type of problem is it?
Bob went to the grocery store. He bought 18 hot dogs and 29
hamburgers for a party. How many more hamburgers did he
buy than hot dogs?
![Page 300: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/300.jpg)
Slide 199 (Answer) / 225
What type of problem is it?
Bob went to the grocery store. He bought 18 hot dogs and 29
hamburgers for a party. How many more hamburgers did he
buy than hot dogs?
Teac
her N
otes
[This object is a teacher notes pull tab]
Work through the problems with the students. Take time
to discuss what type of problem it is. Have students
work on the problems at their desks while another
student completes it on the board.
![Page 301: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/301.jpg)
Slide 200 / 225
What type of problem is it?
Mom bought 36 items at the store. 23 of the items were frozen. How
many items were not frozen?
![Page 302: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/302.jpg)
Slide 201 / 225
What type of problem is it?
Dad baked 24 cookies. Jim ate 13 of the cookies. His sister ate the rest. How many did his sister eat?
![Page 303: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/303.jpg)
Slide 202 / 225
What type of problem is it?
Billy had 16 puppies for sale. 14 of them were bought. How many are left?
![Page 304: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/304.jpg)
Slide 203 / 225
What type of problem is it?
There are 37 peanut butter cups in a bag. John ate 11 and Betty ate 14. How many are left?
![Page 305: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/305.jpg)
Slide 204 / 225
What type of problem is it?
Jess weighs 68 pounds. Her sister weighs 34 pounds. How much less
does her sister weigh?
![Page 306: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/306.jpg)
Slide 205 / 225
55 Which type of subtraction story is this?
Jen had 27 nail polishes. 12 of them broke. How many are left?
A Part/Part/Whole
B Take Away
C Comparison
![Page 307: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/307.jpg)
Slide 205 (Answer) / 225
55 Which type of subtraction story is this?
Jen had 27 nail polishes. 12 of them broke. How many are left?
A Part/Part/Whole
B Take Away
C Comparison[This object is a pull tab]
Ans
wer
B
![Page 308: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/308.jpg)
Slide 206 / 225
56 Which two numbers would you add first?
The pet store has 11 gray kittens and 26 white kittens. 14 kittens were bought. How many kittens are left?
A 11
B 26
C 14
![Page 309: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/309.jpg)
Slide 206 (Answer) / 225
56 Which two numbers would you add first?
The pet store has 11 gray kittens and 26 white kittens. 14 kittens were bought. How many kittens are left?
A 11
B 26
C 14
[This object is a pull tab]
Ans
wer
A and B
![Page 310: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/310.jpg)
Slide 207 / 225
57 Ron has 67 dollars. He went to the store and spent 24 dollars. How much does he have left?
A 91
B 34
C 43
![Page 311: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/311.jpg)
Slide 207 (Answer) / 225
57 Ron has 67 dollars. He went to the store and spent 24 dollars. How much does he have left?
A 91
B 34
C 43[This object is a pull tab]
Ans
wer
C
![Page 312: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/312.jpg)
Slide 208 / 225
58 The computer lab has 35 computers. A class comes and uses 22 computers. How many computers are not being used?
![Page 313: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/313.jpg)
Slide 208 (Answer) / 225
58 The computer lab has 35 computers. A class comes and uses 22 computers. How many computers are not being used?
[This object is a pull tab]
Ans
wer
13
![Page 314: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/314.jpg)
Slide 209 / 225
59 Bob has 57 flowers in his garden. Chris has 45 flowers in his garden. How many more flowers does Bob have?
QUIZ
![Page 315: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/315.jpg)
Slide 209 (Answer) / 225
59 Bob has 57 flowers in his garden. Chris has 45 flowers in his garden. How many more flowers does Bob have?
QUIZ
[This object is a pull tab]
Ans
wer
12
![Page 316: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/316.jpg)
Slide 210 / 225
Lab: Subtraction Around the RoomDirections:
· Print out one copy of the cards and laminate them.· Cut out the cards and tape them around the room.· Students move around the room looking for the subtraction problems.· Students write and solve the subtraction sentence in the box numbered with the same number as the card.
Click to return to Table of Contents
Click here for more information
![Page 317: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/317.jpg)
Slide 211 / 225
![Page 318: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/318.jpg)
Slide 212 / 225
![Page 320: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/320.jpg)
Slide 214 / 225
Fruit Stand Prices
40 40 90 70 20
Use the above prices for each type of fruit to solve the following problems.
![Page 321: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/321.jpg)
Slide 215 / 225
You have 55 cents.You buy an apple.How many cents do you have left?
55- 40
Fruit Stand Prices
40 40 90 70 20
![Page 322: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/322.jpg)
Slide 216 / 225
You have 72 cents.You buy a pear.How many cents do you have left?
72- 40
Fruit Stand Prices
40 40 90 70 20
![Page 323: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/323.jpg)
Slide 217 / 225
You have 63 cents.You buy a strawberry.How many cents do you have left?
63- 20
Fruit Stand Prices
40 40 90 70 20
![Page 324: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/324.jpg)
Slide 218 / 225
You have 63 cents.You buy 2 strawberries.How many cents do you have left?
63-
Fruit Stand Prices
40 40 90 70 20
![Page 325: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/325.jpg)
Slide 218 (Answer) / 225
You have 63 cents.You buy 2 strawberries.How many cents do you have left?
63-
Fruit Stand Prices
40 40 90 70 20Te
ache
r Not
es
[This object is a teacher notes pull tab]
Make sure students notice that they are buying 2
strawberries in this problem. Since it is a two step problem it is important to walk through
it with them the first time.
![Page 326: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/326.jpg)
Slide 219 / 225
You have 90 cents.You buy a pineapple.How many cents do you have left?
Fruit Stand Prices
40 40 90 70 20
![Page 327: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/327.jpg)
Slide 220 / 225
60 You have 80 cents. You buy a tomato. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
![Page 328: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/328.jpg)
Slide 220 (Answer) / 225
60 You have 80 cents. You buy a tomato. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
[This object is a pull tab]
Ans
wer
30
![Page 329: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/329.jpg)
Slide 221 / 225
61 You have 70 cents. You buy a green pepper. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
![Page 330: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/330.jpg)
Slide 221 (Answer) / 225
61 You have 70 cents. You buy a green pepper. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
[This object is a pull tab]
Ans
wer
30
![Page 331: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/331.jpg)
Slide 222 / 225
62 You have 70 cents. You buy a potato. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
![Page 332: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/332.jpg)
Slide 222 (Answer) / 225
62 You have 70 cents. You buy a potato. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
[This object is a pull tab]
Ans
wer
0
![Page 333: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/333.jpg)
Slide 223 / 225
63 You have 90 cents. You buy an ear of corn. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
![Page 334: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/334.jpg)
Slide 223 (Answer) / 225
63 You have 90 cents. You buy an ear of corn. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10[This object is a pull tab]
Ans
wer
30
![Page 335: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/335.jpg)
Slide 224 / 225
64 You have 90 cents. You buy 4 carrots. How many cents do you have left?
Farm Stand Prices
70 50 60 40 10
![Page 336: Slide 1 / 225 - content.njctl.orgcontent.njctl.org/courses/math/1st-grade/2nd-digit-subtraction/unit-8... · Slide 4 / 225 Standards for Mathematical Practices MP 8 Look for and express](https://reader034.vdocuments.mx/reader034/viewer/2022042318/5f07168a7e708231d41b3e23/html5/thumbnails/336.jpg)
Slide 225 / 225