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Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

Last updated 9 months ago

7 questions

Note from the author:

Grade 2 Unit 2
Lesson 6: Compare Methods for Subtraction
CC BY 2021 Illustrative Mathematics

Instructions

Grade 2 Unit 2
Lesson 6: Compare Methods for Subtraction
CC BY 2021 Illustrative Mathematics

Lesson: Compare Methods for Subtraction

True or False: How many Tens? How many Ones? (Warm Up)

1

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

1

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

1

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

Different Ways to Decompose

1

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.

Compare Deigo’s work to Elena’s.

What is the same?

1

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.

Compare Deigo’s work to Elena’s
.
What is different?

1

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.

Tyler used equations to show his thinking.

82 - 9
82 = 70 + 12
12 - 9 = 3
70 + 3 = 73

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

Who do you agree with? Explain.

Cool Down: Mai’s Method

1

Mai was asked to find the difference for 52 - 7. She started, but she got
stuck. Finish Mai’s method.