G1 U9 L8 SJ

Applied MP

MPs * Embedded MP

Conceptual Lesson Grade 1 · Unit 9 · Lesson 8

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MC: 1.OA.6

Today, I will use the relationship between addition and subtraction to find related facts.

Vocabulary

Notes

Use the relationship between addition and subtraction to find related facts:

4+5=9 5+4=9

9—5=4

What 3 numbers are used in these related facts?

4 5 9

9—4=5

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Grade 1 Unit 9 Lesson 8 C SJ

/ Directions: Use the relationship between addition and subtraction to complete the related facts. Identify the 3 numbers used.

1.

6 + 5 = 11

2.

9—1=8

Copyright © Swun Math

Grade 1 Unit 9 Lesson 8 C SJ

Directions: Use the relationship between addition and subtraction to complete the related facts. Identify the 3 numbers used.

1. Use 2 cubes of the same color and 8 cubes of a different color to record the related facts. Record the 3 numbers used in the facts. 2 + 8 = 10 8 + 2 = 10 10 - 2 = 8

10 - 8 = 2 2. Use 6 cubes of the same color and 3 cubes of a different color to record the related facts. Record the 3 numbers used in the facts. 9-3=6 9-6=3 6+3=9 3+6=9

*MP3: Do you agree/disagree with what

said?

*MP6: How do you know your answers are correct/reasonable?

Recap today’s lesson with one or more of the following MP questions: MP2: What steps helped you solve your problems? MP4: How did you know your answers were correct? MP8: Did you use any shortcuts to solve the problems?

Copyright © Swun Math

Grade 1 Unit 9 Lesson 8 C SJ

Copyright © Swun Math

Grade 1 Unit 9 Lesson 8 C SJ