Oct 23-27 Day 1

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SESSION 1
Explore
Adding Decimals

Learning Targets
• Add decimals.
• Explain the strategy used to add decimals.

LESSON 10 • Add Decimals

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Make sense of the problem

Shanika and Jana run in a relay race.
Shanika runs 100 meters in 13.6 seconds.
Jana runs the same distance in
12.2 seconds. What is their total time?

• What information is important

based on what you need to find?

189

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Make connections and explain your thinking

Explain how you can find Shanika and Jana’s
total time.

190

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Make connections and explain your thinking

You can add decimals in different ways, just
like you can add whole numbers in different
ways. Think about the problem 32.14 + 17.5.

a. Write the problem in the place-value chart

below and find the sum.

How did the place-value chart help you add?

190

©Curriculum Associates, LLC Copying is permitted.

Make connections and explain your thinking

You can add decimals in different ways, just
like you can add whole numbers in different
ways. Think about the problem 32.14 + 17.5.

a. Write the problem in the place-value chart

below and find the sum.

How did the place-value chart help you add?

190

©Curriculum Associates, LLC Copying is permitted.

Make connections and explain your thinking

You can add decimals in different ways, just
like you can add whole numbers in different
ways. Think about the problem 32.14 + 17.5.

b. Use expanded form to break apart each

addend by place.

Break apart 32.14: Break apart 17.5:

Find the sum 32.14 + 17.5 by adding the
parts in any order.

190

©Curriculum Associates, LLC Copying is permitted.

Make connections and explain your thinking

You can add decimals in different ways, just
like you can add whole numbers in different
ways. Think about the problem 32.14 + 17.5.

b. Use expanded form to break apart each

addend by place.

190

©Curriculum Associates, LLC Copying is permitted.

©Curriculum Associates, LLC Copying is permitted.

Review

Write the problem 37.2 + 1.6 in
the place-value chart and find
the sum.

How did the place-value chart
help you add?

191

Draw

Write the problem 37.2 + 1.6 in the place value chart and find the sum.

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Close: Exit Ticket

How is adding decimals like adding
whole numbers?

190

Open Ended

How is adding decimals like adding whole numbers?

©Curriculum Associates, LLC Copying is permitted.

Close: Exit Ticket

How is adding decimals like adding
whole numbers?

190