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?