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Unit 5 - Lesson 15 - Grade 5: Illustrative Mathematics

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14 Questions
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Grade 5 Unit 5
Lesson 15: Estimate and Subtract
CC BY 2021 Illustrative Mathematics®
Grade 5 Unit 5
Lesson 15: Estimate and Subtract
CC BY 2021 Illustrative Mathematics®
Lesson: Estimate and Subtract

Number Talk: One and Five Tenths (Warm Up)

Find the value of each expression mentally.
1.

2.

3.

4.

Revisit the Algorithm

5.

Find the value of 8.53 - 2.7. Show your reasoning.

6.

Han used the standard algorithm to subtract decimals. This is Han’s work. Describe what Han did in each step.


7.

Use the standard algorithm to find the value of 6.62 - 3.71.

Estimate and Subtract

8.

Which whole number is the difference 15.27 - 4.3 closest to? Explain or show your reasoning.

9.

What is the value of 15.27 - 4.3? Explain or show your reasoning.

10.

Which whole number is the difference 16.14 - 9.8 closest to? Explain or show your reasoning.

11.

What is the value of 16.14 - 9.8? Explain or show your reasoning.

Compare Calculations to Evaluate a Difference (Optional)

12.

Find the value of 622.35 - 71.4. Explain or show your reasoning.

13.

Elena and Andre found the value of 622.35 - 71.4. Who do you agree with? Explain or show your reasoning.

Cool Down: Subtract Decimals
14.

Find the value of 321.87 - 20.4. Explain or show your reasoning.