# Lesson 20 The Commutative Property

Let’s learn about the commutative property.

## Warm-up Number Talk: Subtraction

Find the value of each expression mentally.

## Activity 1 Learn More About Multiplication

Image A

Image B

## Problem 1

What do you notice? What do you wonder?

## Problem 2

Write an array situation for each array.

How are the situations the same? How are the situations different?

## Problem 3

Write an equation for each situation.

How does your equation connect to the situation and array?

## Activity 2 Revisit Arrays

Write 2 multiplication equations that represent the array.

Explain why both equations can represent the array.

## Practice Problem

## Problem 1

Write a multiplication equation that represents each array.

How are the arrays the same? How are they different?