Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

Last updated 11 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

Cool Down: Mai’s Method

Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

Last updated 11 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)

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

Different Ways to Decompose

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?

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

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

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

Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

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

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

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

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

Different Ways to Decompose

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?

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

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

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.

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

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

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

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

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

Different Ways to Decompose

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?

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

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

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.

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

Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

Unit 2 - Lesson 6 - Grade 2: Illustrative Mathematics

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

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

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

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

Different Ways to Decompose

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?

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.Compare Deigo’s work to Elena’s.What is different?

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.Tyler used equations to show his thinking.82 - 982 = 70 + 1212 - 9 = 370 + 3 = 73Diego says Tyler’s work matches his diagram.Elena says Tyler’s work matches her diagram.Who do you agree with? Explain.

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

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

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

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

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

Different Ways to Decompose

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?

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.Compare Deigo’s work to Elena’s.What is different?

Diego and Elena drew base-ten diagrams to find the value of 82 - 9.Tyler used equations to show his thinking.82 - 982 = 70 + 1212 - 9 = 370 + 3 = 73Diego says Tyler’s work matches his diagram.Elena says Tyler’s work matches her diagram.Who do you agree with? Explain.

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

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?

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

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

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.

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

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?

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

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

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.

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