everyday math grade 4 – lesson 3.9 parentheses in number sentences copyright © 2010 kelly mott

Everyday MathGrade 4 – Lesson 3.9

Parentheses in Number Sentences

Copyright © 2010 Kelly Mott


Math Boxes Lesson 3.9

Page 69


Math Box 1:


Math Box 2:


Math Box 3:


Math Box 4:


Math Box 5:

Everyday MathGrade 4 – Lesson 3.9

Parentheses in Number Sentences


PART 1: REVIEW


A number sentence is a short way of writing a mathematical expression.

EXAMPLEI could write:eight plus six equals fourteenor I could write it this way:8 + 6 = 14

Number Sentences


A number sentence can be TRUE.

EXAMPLE5 x 2 = 10

Number Sentences


A number sentence can be FALSE.

EXAMPLE6 - 2 = 6

Number Sentences


11 + 8 = 19

Circle:True or False

Is it TRUE or FALSE?


157 > 159


17 > 5 x 4


Is it TRUE or FALSE?


18/9 = 3


Let’s try some with our keypads. Tell if each number sentence is TRUE or FALSE.

Number Sentences


Unit 3 ReviewMrs. Gregory

15 + 3 = 28

True

False

0%0%

1.True2.False

5 * 3 =15

True

False

0%0%

1.True2.False

46,568 > 5,003,456

True

False

0%0%

1.True2.False

30 + 2 > 45 -7

True

False

0%0%

1.True2.False

96 + 4 = 100 - 0

True

False

0%0%

1.True2.False

5 x 7 = 15 +20

True

False

0%0%

1.True2.False

17 – 8 + 3 = 13

True

False

0%0%

1.True2.False

9 x 6 > 81/9

True

False

0%0%

1.True2.False

57 – 7 < 8 x 7

True

False

0%0%

1.True2.False

PART 2: SOLVE WITH PARENTHESES


Some number sentences use PARENTHESES.

EXAMPLE(6 – 2) + 4 = 8

Number Sentences


To solve these, you must do what’s in the PARENTHESES first.

(6 – 2) + 4 = 8

Number Sentences


You have to follow the ORDER OF OPERATIONS:

1. PARENTHESES2. EXPONENTS3. MULTIPLY and DIVIDE4. ADD or SUBTRACT


Click on the link to watch the Brain Pop Video:

http://www.brainpop.com/math/numbersandoperations/orderofoperations/




TIP TO REMEMBER: Please Excuse My Dear

Aunt Sally


1. PARENTHESES2. EXPONENTS3. MULTIPLY 4. DIVIDE5. ADD 6. SUBTRACT

A. (28 - 6) + 9 = ______________

B. 28 - (6 + 9) = ______________

Number Sentences


C. (10 - 3) x 2 = ______________

D. 10 - (3 x 2) = ______________

Number Sentences


E. (15 + 2) x 5 = ______________

F. 15 + (2 x 5) = ______________

Number Sentences


G. (4 x 8) - 4 = ______________

H. 4 x (8 - 4) = ______________

Number Sentences


PART 3: TRUE or FALSE with PARENTHESES


Now let’s try some with parentheses and tell whether they are TRUE or FALSE.

Number Sentences


A. (2 x 2) + 10 = 14 True or False

B. 10 = 4 + (1 x 2) True or False

Number Sentences


C. (10 - 3) x 4= 21 True or False

D. 18 = (6 + 3) x 2 True or False

Number Sentences


PART 4: MAKE THE SENTENCE TRUE


• Circle the relationship symbol (= < >)• Start with the side that has numbers and operations.• Try parentheses around the first set of numbers and

operation.• Do the math.• See if it’s true.• If not true, put parentheses around the next set of numbers

and try again.

2 x 3 + 4 = 10

TIPS FOR SOLVING:


8 x 2 + 20 = 36

MAKE THE SENTENCE TRUE


CHECK LIST:

___ Circle the relationship symbol (= < >)

___ Start with the side that has numbers and operations.

___ Try parentheses around the first set of numbers and operation.

___ Do the math.

___ See if it’s true.

___ If not true, put parentheses around the next set of numbers and try again.

25 = 5 x 2 + 3



CHECK LIST:




___ Do the math.



5 x 7 - 5 =10



CHECK LIST:




___ Do the math.



43 = 9 x 5 – 2



CHECK LIST:

___ Circle the relationship symbols (= < >)



___ Do the math.



28 ÷ 7 x 4 = 16



CHECK LIST:




___ Do the math.



12 ÷ 2 x 3 = 2



CHECK LIST:




___ Do the math.



Does this make sense?


a


HOMEWORKPage 68


• Circle the relationship symbol (= < >)• Start with the side that has numbers and operations.• Try parentheses around the first set of numbers and

operation.• Do the math.• See if it’s true.• If not true, put parentheses around the next set of

numbers and try again.

TIPS


everyday math grade 4 – lesson 3.9 parentheses in number sentences copyright © 2010 kelly mott

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