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
What do you notice? What do you wonder?
Write an array situation for each array.
How are the situations the same? How are the situations different?
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.
Write a multiplication equation that represents each array.
How are the arrays the same? How are they different?