# Prime factors

In this lesson, we will be investigating the properties and definition of prime factors of numbers, and how to calculate them.

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.What is the definition of a factor?

1/5

Q2.What is a prime number? (There may be multiple answers)

2/5

Q3.Which of these is not a prime number?

3/5

Q4.Which of these is not a factor of 16?

4/5

Q5.Why do square numbers have an odd number of factors?

5/5

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.What is the definition of a factor?

1/5

Q2.What is a prime number? (There may be multiple answers)

2/5

Q3.Which of these is not a prime number?

3/5

Q4.Which of these is not a factor of 16?

4/5

Q5.Why do square numbers have an odd number of factors?

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.

Quiz:

# Prime factors

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What is the first prime number?

1/5

Q2.What are the prime factors of 18?

2/5

Q3.What is the 7th prime number?

3/5

Q4.12 written as a product of prime factors is 2 x 2 x 3. What is 30 written using prime factors?

4/5

Q5.Which of the following is not a prime factor of 42?

5/5

Quiz:

# Prime factors

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What is the first prime number?

1/5

Q2.What are the prime factors of 18?

2/5

Q3.What is the 7th prime number?

3/5

Q4.12 written as a product of prime factors is 2 x 2 x 3. What is 30 written using prime factors?

4/5

Q5.Which of the following is not a prime factor of 42?

5/5

# Lesson summary: Prime factors

## Time to move!

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

For 5 mins...

Move around:
Climb stairs

On the spot:
Chair yoga