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Unit 2 - Lesson 9 - Grade 2: Illustrative Mathematics

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

Which One Doesn’t Belong: Tens and Ones (Warm Up)

1.

Which one doesn’t belong?

Sort and Find the Value

Match each expression to a base-ten diagram.
2.

Choose 1 addition expression and find the value of the sum.

3.

Choose 1 subtraction expression and find the value of the difference.

Add or Subtract

Find the value of each expression. Show your thinking. Use blocks if it helps.
4.

5.

6.

7.

Cool Down: Find the Value Your Way
Find the value of each expression. Show your thinking. Use blocks if it helps.
8.

9.