G1 U4 L10 SJ

Applied MP

MPs * Embedded MP

Conceptual Lesson Grade 1 · Unit 4 · Lesson 10

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MC: 1.OA.2

Today, I will add three addends to find an unknown sum.

Vocabulary

Steps

Adding 3 addends: adding together three numbers in an equation.

3 + 3 + 4 = x (unknown)

1. Pick a strategy to add two of the three addends together. 2. Add the sum of those addends to the third addend. 3. Record the sum of all three and solve for the unknown.

6 + 4 10 = x Drawing Solve for the unknown:

3 3 + 4

6 + 4

Solve for the unknown:

= 10

Copyright © Swun Math

Grade 1 Unit 4 Lesson 10 C SJ

/ Directions: Solve the addition problems with three addends.

1.

2 2 + 3 P P=

2.

5+2+3=

=

Copyright © Swun Math

Grade 1 Unit 4 Lesson 10 C SJ

Directions: Solve the addition problems with three addends.

8+1+5=

1.

= 0 8 + 4 X

2.

X=

*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: MP1: What did you do first? Why? MP4: How can you relate this to something in real life? MP8: What strategies did you use to help solve the problems?

Copyright © Swun Math

Grade 1 Unit 4 Lesson 10 C SJ