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K-5 Grade 2 Unit 2 Lesson 6

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•K-5 Math 6-8 Math 9-12 Math

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Lesson 6

Warm-up Activity 1 Activity 2

Unit 2, Lesson 6

Compare Methods for Subtraction

Grade 2

Warm-up

Decide if each statement is true or false. Be prepared to explain your reasoning.

Activity 1

Diego and Elena draw base-ten diagrams to decompose a ten.

Diego’s diagram:

Base ten diagram. 8 tens and 2 ones. One of the tens is crossed out with an arrow pointing to a circle with ten ones inside. The two ones are crossed out and 7 ones inside the circle are crossed out.

Elena's diagram:

Base ten diagram. 7 tens and 12 ones. 9 ones are crossed out.

Compare the base-ten diagrams.
1. How are the diagrams alike?
2. How are they different?
Tyler used equations to show his thinking.

Diego says Tyler’s work matches his diagram.
Elena says it matches her diagram.

Diego’s diagram:

Elena's diagram:

Do you agree with Diego or Elena? Explain your reasoning.

Activity 2

None