# Using commutativity and associativity to multiply

In this lesson, we will explore the laws of multiplication, and use known facts and the laws of commutativity and associativity to perform efficient multiplication.

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#### Unit quizzes are being retired in August 2023

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Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.I scored 13, 15 and double 9 on the dart board. What is my total?

1/5

Q2.I scored 11, triple 6 and double 8 on the dart board. What is my total?

2/5

Q3.I scored double 2, triple 10 and a bullseye. What is my total?

3/5

Q4.I have 300 points. I have just deducted 87 points. How many points do I have left?

4/5

Q5.I have 201 points. I have just deducted 93 points. How many points do I have left?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.I scored 13, 15 and double 9 on the dart board. What is my total?

1/5

Q2.I scored 11, triple 6 and double 8 on the dart board. What is my total?

2/5

Q3.I scored double 2, triple 10 and a bullseye. What is my total?

3/5

Q4.I have 300 points. I have just deducted 87 points. How many points do I have left?

4/5

Q5.I have 201 points. I have just deducted 93 points. How many points do I have left?

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Using Commutativity and Associativity to Multiply Quiz

Can you use commutativity and associativity to multiply? Take the quiz to test our your new learning.

Q1.What is the commutative law in multiplication?

1/5

Q2.What is the associative law in multiplication?

2/5

Q3.Which law do you use when multiplying 2 x 5 x 6?

3/5

Q4.When multiplying 6 x 2 x 5, which is the most efficient order?

4/5

Q5.8 x 4 x 10 = 4 x 10 x 8. True or false?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Using Commutativity and Associativity to Multiply Quiz

Can you use commutativity and associativity to multiply? Take the quiz to test our your new learning.

Q1.What is the commutative law in multiplication?

1/5

Q2.What is the associative law in multiplication?

2/5

Q3.Which law do you use when multiplying 2 x 5 x 6?

3/5

Q4.When multiplying 6 x 2 x 5, which is the most efficient order?

4/5

Q5.8 x 4 x 10 = 4 x 10 x 8. True or false?

5/5

# Lesson summary: Using commutativity and associativity to multiply

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## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Jog

On the spot:
Chair yoga