Library

Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

By Formative Library
Last updated 2 months ago
7 Questions
Note from the author:
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
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.

2.

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

3.

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

Different Ways to Decompose

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?

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?

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.


Cool Down: Mai’s Method
7.

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