Highest common factor

In this lesson, we will revisit factors and learn about highest common factors.

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.

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!

Q1.75 = 15 x .....
These numbers have been written in prime factor form. Use the information here to help you answer the questions.

1/5

Q2.168 = ..... x 21

2/5

Q3.Which of these is not a factor of 42?

3/5

Q4.One of the factors of 168 is a square number.

4/5

Q5.Which two numbers will multiply to make a square number?

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.

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!

Q1.75 = 15 x .....
These numbers have been written in prime factor form. Use the information here to help you answer the questions.

1/5

Q2.168 = ..... x 21

2/5

Q3.Which of these is not a factor of 42?

3/5

Q4.One of the factors of 168 is a square number.

4/5

Q5.Which two numbers will multiply to make a square number?

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

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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.

Quiz:

Highest common factor.

Exit Quiz

Q1.Which of these is not a factor of 27?

1/6

Q2.Which is not a factor of 54?

2/6

Q3.Which is a common factor of 28 and 36?

3/6

Q4.What is the highest common factor of 6 and 9?

4/6

Q5.What is the HCF of 30 and 42?

5/6

Q6.True or False? If the HCF is 12, then 4 and 3 are common factors.

6/6

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.

Quiz:

Highest common factor.

Exit Quiz

Q1.Which of these is not a factor of 27?

1/6

Q2.Which is not a factor of 54?

2/6

Q3.Which is a common factor of 28 and 36?

3/6

Q4.What is the highest common factor of 6 and 9?

4/6

Q5.What is the HCF of 30 and 42?

5/6

Q6.True or False? If the HCF is 12, then 4 and 3 are common factors.

6/6

Lesson summary: Highest common factor

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