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Unit 9 - Lesson 8 - Grade 2: Illustrative Mathematics

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Grade 2 Unit 9
Lesson 8: Add and Subtract Within 100
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 9
Lesson 8: Add and Subtract Within 100
CC BY 2021 Illustrative Mathematics®
Lesson: Add and Subtract Within 100

Number Talk: Add by Place (Warm Up)

Find the value of each expression mentally.
1.

9 + 5

2.

20 + 30

3.

29 + 35

4.

229 + 435

Heads Up, Add and Subtract within 100

Write an equation that shows the value you found for each round you play.
5.

Round 1:

6.

Round 2:

7.

Round 3:

Centers: Choice Time

Five in a Row

Target Numbers

Cool Down: Practice for Fluency
8.

How have you improved with adding and subtracting within 100?

9.

What do you still want to work on?