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Unit 3 - Lesson 3 - Grade 3: Illustrative Mathematics

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Last updated 2 months ago
11 Questions
Note from the author:
Grade 3 Unit 3
Lesson 3: Add Your Way
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 3: Add Your Way
CC BY 2021 Illustrative Mathematics®
Lesson: Add Your Way

Number Talk: Hundreds, Tens, and Ones (Warm Up)

Find the value of each expression mentally.

1.

200 + 40 + 7

2.

50 + 300 + 2

3.

40 + 600 + 12

4.

500 + 17 + 130

Strategies to Add

Find the value of each sum in any way that makes sense to you. Explain or show your reasoning.
5.

325 + 102

6.

301 + 52

7.

276 + 118

8.

298 + 305

Two Ways to Add

Andre found the value of 276 + 118. His work is shown.



Clare found the value of 276 + 118. Her work is shown.

9.

With your partner, discuss:

What’s different about Clare and Andre’s work?

10.

With your partner, discuss:

What’s the same?

Cool Down: Add It Up
11.

Find the value of 258 + 217. Explain or show your reasoning.