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Course: 5th grade foundations (Eureka Math/EngageNY) >Unit 5

Lesson 2: Topic B: Foundations

Associative property of multiplication review

Review the basics of the associative property of multiplication, and try some practice problems.

What is the associative property?

The associative property is a math rule that says that the way in which factors are grouped in a multiplication problem does not change the product.
Example:
$5×4×2$
Let's start by grouping the $5$ and the $4$ together. We can evaluate the expression step by step.
$\phantom{=}\left(5×4\right)×2$
$=20×2$
$=40$
Now let's group the $4$ and the $2$ together.
$\phantom{=}5×\left(4×2\right)$
$=5×8$
$=40$
Regrouping does not change the answer!

Practice

Problem 1
Which expressions are equivalent to $\left(9×2\right)×5$ ?

Want to try more problems like this? Check out this exercise.

Want to join the conversation?

• The problem is that I sometimes get confused and the answer is wrong
• Its okay just keep trying and you'll get it done in under 30 seconds. =D
• why did it put the answer for the wrong equation if he made the mistake in step 2 the answer should of been 80, 80 was the correct answer
• y=-3 0(-3)+(-7) 8,345.271
• why was it so easy love it
• why did it push me back when I went to another Question It is very hard why
• how do u find the answer
• i am not getting this a little bit
• The questions are easy if you do them more and more.