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Unit 4 - Lesson 14 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 4
Lesson 14: Ways to Represent Multiplication of Teen Numbers
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 4
Lesson 14: Ways to Represent Multiplication of Teen Numbers
CC BY 2021 Illustrative Mathematics®
Lesson: Ways to Represent Multiplication of Teen Numbers

Notice and Wonder: Seeing Groups (Warm Up)

1.

What do you notice?

2.

What do you wonder?

A Factor Greater than Ten

3.

Tyler says he can use base-ten blocks to find the value of 7 x 13 because he knows 7 x 10 and 7 x 3. He says this diagram proves his thinking.


Do you agree or disagree? Explain your reasoning.

4.

Use Tyler’s method to find the value of 3 x 14. Explain or show your reasoning.

Ways to Represent

Andre, Clare, and Diego represented the same expression. Their representations are shown below.

5.

Where do you see the factors in each diagram?

6.

Where do you see the product in each diagram?

Cool Down: Multiply and Explain
7.

Find the value of 5 x 15 and explain how it’s represented in the diagram.