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Unit 2 - Lesson 2 - Grade 2: Illustrative Mathematics

Last updated 9 months ago
6 questions
Note from the author:
Grade 2 Unit 2
Lesson 2: Find the Unknown Addend
CC BY 2021 Illustrative Mathematics
Grade 2 Unit 2
Lesson 2: Find the Unknown Addend
CC BY 2021 Illustrative Mathematics
Lesson: Find the Unknown Addend

How Did You Find It?

1


What is the same and what is different between these tools?

1
Find the number that makes the equation true. Show your thinking using the cubes, blocks, or drawings.

41 +_______ = 84

You Go This Way, I’ll Go That Way

Han and Mai use blocks to find the number that makes the equation true. 17 + _____ = 84
1

Han starts by using blocks to show 17. Show how he could find the number that makes the equation true.

1

Mai starts by using blocks to show 48. Show how she could find the number that makes the equation true.

1
Try this one on your own. Choose who will start with 21 and who will start with 96.

21 +_______ = 96
Show your partner how you found the number that makes the equation true.
Cool Down: Find the Unknown Addend
1
Find the number that makes the equation true. Show your thinking. Use blocks or cubes if it helps.

36 + _______ = 78