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Unit 4 - Lesson 1 - Grade 5: Illustrative Mathematics

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Grade 5 Unit 4
Lesson 1: Estimate and Find Products
CC BY 2021 Illustrative Mathematics®
Grade 5 Unit 4
Lesson 1: Estimate and Find Products
CC BY 2021 Illustrative Mathematics®
Lesson: Estimate and Find Products

Number Talk: A Multiple of 10 (Warm Up)

Find the value of each product mentally.
1.

2.

3.

4.

Reasonable Estimates

5.

Which estimate for the product 18 x 149 is most reasonable?

6.

Explain or show your reasoning.

7.

Are any of the estimates unreasonable? Explain or show your reasoning.

8.

Do you think the actual product will be more or less than your estimate? Explain or show your reasoning.

Multiply by 18

Find the value of each expression. Explain or show your reasoning.
9.

10.

11.

Cool Down: Fifteen
Find the value of each expression. Explain or show your reasoning.
12.

13.

14.