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Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics
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Instructions
Lesson: Compare Methods for Subtraction
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Cool Down: Mai’s Method
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Grade 2 Unit 2
Lesson 6: Compare Methods for Subtraction
CC BY 2021 Illustrative Mathematics
Grade 2 Unit 2
Lesson 6: Compare Methods for Subtraction
CC BY 2021 Illustrative Mathematics
True or False: How many Tens? How many Ones? (Warm Up)
Question 1
1.
Decide if each statement is true or false. Be prepared to explain your reasoning.
True
False
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Question 2
2.
Decide if each statement is true or false. Be prepared to explain your reasoning.
True
False
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Question 3
3.
Decide if each statement is true or false. Be prepared to explain your reasoning.
True
False
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Different Ways to Decompose
Question 4
4.
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?
Question 5
5.
Diego and Elena drew base-ten diagrams to find the value of 82 - 9.
Compare Deigo’s work to Elena’s
.
What is different?
Question 6
6.
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.
Question 7
7.
Mai was asked to find the difference for 52 - 7. She started, but she got
stuck. Finish Mai’s method.
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