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Unit 9 - Lesson 1 - Grade 2: Illustrative Mathematics

Last updated 9 months ago
42 questions
Note from the author:
Grade 2 Unit 9
Lesson 1: Sums and Differences Within 20
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 9
Lesson 1: Sums and Differences Within 20
CC BY 2021 Illustrative Mathematics®
Lesson: Sums and Differences Within 20

Number Talk: Subtract Within 20 (Warm Up)

Find the value of each expression mentally.
1

10 - 5

1

11 - 5

1

12 - 6

1

13 - 6

Check Yourself

Find the value of each sum mentally.
1

6 + 6

1

9 + 9

1

7 + 7

1

8 + 8

1

5 + 5

1

9 + 8

1

7 + 8

1

8 + 5

1

6 + 5

1

7 + 6

1

7 + 9

1

6 + 8

1

9 + 2

1

7 + 5

1

8 + 4

1

2 + 9

1

9 + 7

1

6 + 9

1

8 + 3

1

9 + 4

1

8 + 6

1

3 + 9

1

5 + 6

1

9 + 5

1

5 + 9

1

9 + 6

1

8 + 9

1

6 + 7

1

5 + 7

1

8 + 7

1

Circle any sum that you did not remember right away.

Write each sum you circled on an index card.

Use the index cards to work on building fluency with these sums.

Spin and Find the Missing Number

Directions:
• Spin the top spinner to get your total.
• Spin the bottom spinner to get one addend.
• Find the unknown addend.
0

Write an equation to show how you found the unknown addend.

Cool Down: Add and Subtract with Fluency
Find the value of each expression.
1

11 - 5

1

12 - 3

1

16 - 8

1

9 + 3

1

8 + 8

1

13 - 8