nys math module 1 lesson 9 objective: add decimals using place value strategies and relate those...
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NYS Math Module 1 Lesson 9
Objective: Add decimals using place value strategies and relate those strategies to a
written method.
5.NBT.4 Round to different place values5.NBT.1 Decompose the unit5.NBT.7 Adding decimals
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Sprint
****8 minutes****Ready, Set
GO!!
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Decomposing the Unit!
Say this number: 6.35
How many tenths are in 6.35? 63 tenths
6.358 = 63 tenths ____ thousandths
Think about money. How many dimes are there?
58
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One more!
Say this number: 7.354
How many tenths are in 7.354?73 tenths
7.354 = 73 tenths ____ thousandths54
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Rounding!
Say this number: 2.475
On your board, round to the nearest tenth.
2.5
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Round 2.457 to the nearest hundredth.
2.46
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Round 2.987 to the nearest hundredth.
2.99
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Round 2.987 to the nearest tenth.
3
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Oral Fluency
I’m going to show you a decimal, you need to say the decimal that is one
tenth more.
0.5 0.7 0.9
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Now, we are going to count by hundredths. Say the decimal that is one hundredth more than the given
value.
0.05 0.07 0.09
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Say the decimal that is two tenths more than the given value.
0.3 0.7What is 1 tenth more than 35
hundredths?
0.45Write down 35
hundredths, then add 1 tenth
0.11
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What is 1 thousandth more than 35 hundredths?
0.351What is 1 hundredth more than 485
thousandths?
0.495Remember to
write the number first.
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Word ProblemTen baseballs weigh 1,417.4 grams. About how
much does 1 baseball weigh? Round your answer to the nearest tenth of a gram. Round your answer to the nearest gram. If someone asked you, “About how much does a baseball
weigh?” which answer would you give them and why?
Share your answer with your partner.
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Word Problem Solution
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Adding DecimalsLet’s add 2 tenths plus 6 tenths using our place value charts.
8 tenthsWrite the addition sentence on your board.
2 tenths + 6 tenths = 8 tenthsHow is this problem the same as a whole
number addition problem?
Turn to your partner and share.
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Work with your partner to solve the next two problems on your place value chart.
2 ones 3 thousandths + 6 ones 1 thousandth
2 tenths 3 thousandths + 6 hundredths
2.003 + 6.001 = 8.004
Let’s write it vertically!
0.2030.0600.263
+
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1.8 + 13 tenths
Let’s look at the following problem:
How would you write 13 tenths? Write it on your white board. 13 tenths = 1.3
Solve: 1.8 + 13 tenths
3.1
Draw a picture to represent 13 tenths. You may use your place value chart.
Share with your partner
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Another way to add and subtract decimals.
Tip #1 - ALWAYS line up the decimal! This means the decimals are one on top of another.
0.74 + 0.59
Let’s write it vertically!
0.740.591.33
+
Tip #2 – Add ZEROS in all the empty spaces.
Let’s give it a try.
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7.048 + 5.196
Try solving the last two problems.
12.244
7.44 + 0.774
8.214
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Clip art from Colleen Alaniz- Totally Terrific in Texas http://www.teacherspayteachers.com/Store/Colleen-Alaniz
Thank you for downloading this presentation.
.
Laura Stricklandwww.MyCuteGraphics.com
Backgrounds, clip art, and font by:.
The following pages are from NYS Math Modules. I minimized the images to reduce the paper waste and thought they may be
helpful to others as well. For the entire module visit:
http://www.engageny.org/resource/grade-5-mathematics-module-
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