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K-5 Grade 3 Unit 4 Lesson 14

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Lesson 14

Warm-up Activity 1 Activity 2

Unit 4, Lesson 14

Ways to Represent Multiplication of Teen Numbers

Grade 3

Warm-up

What do you notice? What do you wonder?

2 groups of 12 squares.

Base ten blocks. 2 groups of 1 ten and 2 ones.

<p>Base ten blocks. 2 sets of 1 ten and 2 ones.</p>

Activity 1

Tyler says he can find the value of because he knows and . He says the diagram of base-ten blocks proves his thinking.

Do you agree or disagree? Explain your reasoning.
Use Tyler’s method to find the value of . Explain or show your reasoning.

Activity 2

Andre, Clare, and Diego represented the same expression in different ways

Area diagram. Rectangle divided into 2 parts. — Andre

<p>Base ten blocks.</p>

<p></p> — Clare

Area diagram. — Diego

Where do you see the factors in each representation?
Where do you see the product in each representation?