# Highest common factors and prime factors

In this lesson, we will use venn diagrams to sort prime factors and to help in identifying highest common factors.

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.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

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.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

# 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.

Quiz:

# HCF and prime factors.

Exit Quiz

Q1.Which represents 24 as a product of prime factors?

1/5

Q2.What number should replace the square in the Venn diagram?

2/5

Q3.What number should replace the square in the Venn diagram?1

3/5

Q4.Using the Venn diagram, what is the HCF of 24 and 36?

4/5

Q5.True or False? Sometimes there isn’t a highest common factor!

5/5

Quiz:

# HCF and prime factors.

Exit Quiz

Q1.Which represents 24 as a product of prime factors?

1/5

Q2.What number should replace the square in the Venn diagram?

2/5

Q3.What number should replace the square in the Venn diagram?1

3/5

Q4.Using the Venn diagram, what is the HCF of 24 and 36?

4/5

Q5.True or False? Sometimes there isn’t a highest common factor!

5/5

# Lesson summary: Highest common factors and prime factors

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga