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K-5 Grade 1 Unit 3 Lesson 24

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•K-5 Math 6-8 Math 9-12 Math

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Lesson 24

Warm-up Activity 1 Activity 2

Unit 3, Lesson 24

Relate Counting to Addition and Subtraction

Grade 1

Warm-up

None

Activity 1

We saw 2 ways to find the value of .

Diego’s way

Ten frame. 7 counters not crossed out. 3 counters crossed out.

Ten frame. 5 red counters crossed out.

Tyler’s way

Ten frame, full. Red, 8. Yellow, 2.

Ten frame. 5 yellow counters.

Find the value of each difference. Use Diego’s way. Then use Tyler’s way.

Diego’s way

Tyler’s way

Diego’s way

Tyler’s way

Activity 2

Find the number that makes each equation true.

Set A:

Set B: