Math

Illustrative Mathematics
IM K-5 MATH





Unit 9





Lesson 12
What's the Story?

Let's write story problems.

How many people are in the picture?

Warm-up: Estimation Exploration: How many People?

​too low

​about right

​too high

​Record an estimate that is:

​12.1: What's the Story?

​Your teacher will assign you A or B. For each of your equations, write a story problem that fits the equation.

​A Equations


23 + _______ = 37
_______ + 9 = 45

​B Equations


73 - _______ = 28
_____ - 15 = 18

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​12.2: Make Math Stories

​Write a story problem.

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​We have now completed Illustrative Mathematics - Unit 9 - Lesson 12.