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Unit 2 - Lesson 2 - Grade 2: Illustrative Mathematics

By Formative Library
Last updated 2 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?

2.
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
3.

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

4.

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

5.
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
6.
Find the number that makes the equation true. Show your thinking. Use blocks or cubes if it helps.

36 + _______ = 78