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Unit 7 - Lesson 9 - Grade 2: Illustrative Mathematics

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Grade 2 Unit 7
Lesson 9: Add Three-digit Numbers
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 9: Add Three-digit Numbers
CC BY 2021 Illustrative Mathematics®
Lesson: Add Three-digit Numbers

Number Talk: Ten and Some More (Warm Up)

Find the value of each expression mentally.
1.

528 + 2

2.

528 + 7

3.

487 + 3

4.

487 + 8

How Did You Add Three-digit Numbers?

Find the value of each expression. Show your thinking.
5.

384 + 409

6.

757 + 152

7.

262 + 438

8.

575 + 166

Analyze and Add

Noah and Kiran showed how they found the value of 267 + 338.

9.

How is Noah and Kiran’s work the same? How is it different?

10.

Which student found the correct value? Explain or show your thinking.

Cool Down: Find the Sum
Priya used a diagram to find the value of 565 + 247.

11.

Did she find the correct value? Explain or show your thinking.