Unit 3 - Lesson 9 - Grade 3: Illustrative Mathematics

Last updated 11 months ago

14 questions

Note from the author:

Grade 3 Unit 3
Lesson 9: Subtraction Algorithms (Part 2)
CC BY 2021 Illustrative Mathematics®

Instructions

Grade 3 Unit 3
Lesson 9: Subtraction Algorithms (Part 2)
CC BY 2021 Illustrative Mathematics®

Lesson: Subtraction Algorithms (Part 2)

Cool Down: How Did Andre Subtract?

Unit 3 - Lesson 9 - Grade 3: Illustrative Mathematics

Unit 3 - Lesson 9 - Grade 3: Illustrative Mathematics

True or False: Does It Commute? (Warm Up)

Explain your reasoning.

Explain your reasoning.

Revise Subtraction Work

What error do you see in Lin's work?

What would you tell or show Lin so she can revise her work?

Try the Algorithm

283 - 159

Andre found the value of 739 - 255. His work is shown.

Explain how he subtracted and the value he found for 739 - 255.

True or False: Does It Commute? (Warm Up)

4 x 5 = 5 x 4

Explain your reasoning.

125 + 200 = 200 + 125

Explain your reasoning.

300 - 100 = 100 - 300

Explain your reasoning.

Revise Subtraction Work

What error do you see in Lin's work?

What would you tell or show Lin so she can revise her work?

Try the Algorithm

283 - 159

425 - 192

639 - 465

591 - 128

832 - 575

Andre found the value of 739 - 255. His work is shown.

Explain how he subtracted and the value he found for 739 - 255.

4 x 5 = 5 x 4

125 + 200 = 200 + 125

300 - 100 = 100 - 300

Explain your reasoning.

425 - 192

639 - 465

591 - 128

832 - 575

Unit 3 - Lesson 9 - Grade 3: Illustrative Mathematics

Unit 3 - Lesson 9 - Grade 3: Illustrative Mathematics

True or False: Does It Commute? (Warm Up)

Explain your reasoning.

Explain your reasoning.

Revise Subtraction Work

What error do you see in Lin's work?

What would you tell or show Lin so she can revise her work?

Try the Algorithm

283 - 159

Andre found the value of 739 - 255. His work is shown.Explain how he subtracted and the value he found for 739 - 255.

True or False: Does It Commute? (Warm Up)

4 x 5 = 5 x 4

Explain your reasoning.

125 + 200 = 200 + 125

Explain your reasoning.

300 - 100 = 100 - 300

Explain your reasoning.

Revise Subtraction Work

What error do you see in Lin's work?

What would you tell or show Lin so she can revise her work?

Try the Algorithm

283 - 159

425 - 192

639 - 465

591 - 128

832 - 575

Andre found the value of 739 - 255. His work is shown.Explain how he subtracted and the value he found for 739 - 255.

4 x 5 = 5 x 4

125 + 200 = 200 + 125

300 - 100 = 100 - 300

Explain your reasoning.

425 - 192

639 - 465

591 - 128

832 - 575

Andre found the value of 739 - 255. His work is shown.

Explain how he subtracted and the value he found for 739 - 255.

Andre found the value of 739 - 255. His work is shown.

Explain how he subtracted and the value he found for 739 - 255.