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Unit 3 - Lesson 6 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 3
Lesson 6: Use Strategies and Algorithms to Add
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 6: Use Strategies and Algorithms to Add
CC BY 2021 Illustrative Mathematics®
Lesson: Use Strategies and Algorithms to Add

Number Talk: Little More, Little Less (Warm Up)

Find the value of each expression mentally.
1.

300 + 156

2.

299 + 156

3.

303 + 156

4.

204 + 376

Just Ones

5.

Two methods of recording the addition of 657 + 286 are shown.


How is the newly composed ten and hundred recorded differently in each method?

Try the second method of recording to add these numbers:

6.

602 + 179

7.

493 + 161

8.

438 + 364

9.

329 + 381

How Would You Add?

Use a strategy of your choice to find the value of each sum. Show your reasoning. Organize it so it can be followed by others.

10.

199 + 348

11.

264 + 359

12.

203 + 75

13.

316 + 198

14.

399 + 499

Cool Down: Algorithm or Another Strategy?
15.

Would you use an algorithm or another strategy to find the value of 299 + 179?

Explain your reasoning.