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Unit 5 - Lesson 15 - Grade 5: Illustrative Mathematics
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Instructions
Lesson: Estimate and Subtract
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Cool Down: Subtract Decimals
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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®
Number Talk: One and Five Tenths (Warm Up)
Find the value of each expression mentally.
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Question 1
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Question 2
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Question 3
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Revisit the Algorithm
Question 5
5.
Find the value of 8.53 - 2.7. Show your reasoning.
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Question 6
6.
Han used the standard algorithm to subtract decimals. This is Han’s work. Describe what Han did in each step.
Question 7
7.
Use the standard algorithm to find the value of 6.62 - 3.71.
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Estimate and Subtract
Question 8
8.
Which whole number is the difference 15.27 - 4.3 closest to? Explain or show your reasoning.
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Question 9
9.
What is the value of 15.27 - 4.3? Explain or show your reasoning.
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Question 10
10.
Which whole number is the difference 16.14 - 9.8 closest to? Explain or show your reasoning.
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Question 11
11.
What is the value of 16.14 - 9.8? Explain or show your reasoning.
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Compare Calculations to Evaluate a Difference (Optional)
Question 12
12.
Find the value of 622.35 - 71.4. Explain or show your reasoning.
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Question 13
13.
Elena and Andre found the value of 622.35 - 71.4. Who do you agree with? Explain or show your reasoning.
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Question 14
14.
Find the value of 321.87 - 20.4. Explain or show your reasoning.
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Question 4
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