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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 values 5.NBT.1 Decompose the unit 5.NBT.7 Adding decimals

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Sprint ****8 minutes**** Ready, Set GO!!

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**6.358 = 63 tenths ____ thousandths**

Decomposing the Unit! Think about money. How many dimes are there? Say this number: 6.35 How many tenths are in 6.35? 63 tenths 6.358 = 63 tenths ____ thousandths 58

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**7.354 = 73 tenths ____ thousandths**

One more! Say this number: 7.354 How many tenths are in 7.354? 73 tenths 7.354 = 73 tenths ____ thousandths 54

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**On your board, round to the nearest tenth.**

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.**

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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**

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 0.7 0.11 What is 1 tenth more than 35 hundredths? Write down 35 hundredths, then add 1 tenth 0.45

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**0.351 0.495 What is 1 thousandth more than 35 hundredths?**

What is 1 hundredth more than 485 thousandths? Remember to write the number first. 0.495

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**Share your answer with your partner.**

Word Problem Ten 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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**How is this problem the same as a whole number addition problem?**

Adding Decimals Let’s add 2 tenths plus 6 tenths using our place value charts. 8 tenths Write the addition sentence on your board. 2 tenths + 6 tenths = 8 tenths How 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 = 8.004 2 tenths 3 thousandths + 6 hundredths 0.203 0.060 0.263 + Let’s write it vertically!

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**Let’s look at the following problem:**

tenths How would you write 13 tenths? Write it on your white board. 13 tenths = 1.3 Draw a picture to represent 13 tenths. You may use your place value chart. Share with your partner Solve: tenths 3.1

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**Let’s write it vertically!**

Another way to add and subtract decimals. Tip #1 - ALWAYS line up the decimal! This means the decimals are one on top of another. Tip #2 – Add ZEROS in all the empty spaces. Let’s give it a try. 0.74 0.59 1.33 + Let’s write it vertically!

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**Try solving the last two problems.**

12.244 8.214

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**Thank you for downloading this presentation.**

Backgrounds, clip art, and font by:. Laura Strickland Clip art from Colleen Alaniz- Totally Terrific in Texas 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:

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