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Unit 5 - Lesson 12 - Grade 5: Illustrative Mathematics

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Last updated 11 months ago
12 questions
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Grade 5 Unit 5
Lesson 12: Estimate and Add
CC BY 2021 Illustrative Mathematics
Grade 5 Unit 5
Lesson 12: Estimate and Add
CC BY 2021 Illustrative Mathematics
Lesson: Estimate and Add
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Cool Down: Sums of Decimals
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Number Talk: 99 Hundredths (Warm Up)

Find the value of each expression mentally.
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Question 1
1.

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Question 2
2.

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Question 3
3.

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Question 4
4.

Use the Standard Algorithm to Add Decimals

Question 5
5.

Find the value of 5.61 + 2.53. Explain or show your reasoning.

Question 6
6.

Han used the standard algorithm to add 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 + 3.74.

Estimate and Find the Value

Question 8
8.

Which whole number is the sum 2.82 + 5.2 closest to? Explain or show your reasoning.

Question 9
9.

What is the value of 2.82 + 5.2? Explain or show your reasoning. Use the standard algorithm if it is helpful.

Question 10
10.

Which whole number is the sum 6.8 + 4.97 closest to? Explain or show your reasoning.

Question 11
11.

What is the value of 6.8 + 4.97? Explain or show your reasoning. Use the standard algorithm if it is helpful.

Question 12
12.

Find the value of 3.45 + 21.6. Explain or show your reasoning.