# Lesson 16 Multiply Numbers Larger than 20

• Let’s multiply numbers that are larger than 20.

## Warm-up Number Talk: Three Times Some Numbers

Find the value of each expression mentally.

## Problem 1

Here is how Clare and Andre represented  .

1. How does each diagram show ?

2. How could we use Clare’s diagram to find the value of ?

3. How could we use Andre’s diagram to find the value of ?

## Problem 2

Diego tried different ways to partition or split a diagram to help him find the value of .

1. What do you notice about the numbers in his diagrams?

2. Which diagram would you use to find the value of ? Explain your reasoning.

## Problem 3

Find the value of . Show your thinking using diagrams, symbols, or other representations.

## Problem 1

To find the value of , Mai started by writing this equation:

Describe or show what Mai would do to finish finding the value of .

## Problem 2

Find the value of each product. Show your reasoning.

## Activity 3 Play Close to 100, Multiplication

Play Close to 100, Multiplication with a partner.

1. Place the cards face down.

2. Each player draws 4 cards.

3. Each player chooses 2 cards to complete the expression to make a value as close to 100 as possible. Write the 2 digits and the product.

4. Player closest to 100 wins.

5. Play 5 rounds. Player who wins the most rounds wins.

Game 1

Round 1

Round 2

Round 3

Round 4

Round 5

Game 2

Round 1

Round 2

Round 3

Round 4

Round 5

## Problem 1

Find the value of each expression. Explain or show your reasoning.