# Prime Deductions

In this lesson, we will use our knowledge of prime factorisation to deduce the factors of numbers.

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.Express 42 as a product of its prime factors

1/5

Q2.Express 144 as a product of its prime factors.

2/5

Q3.Express 80 as a product of its prime factors.

3/5

Q4.Express 35 x 10 as a product of its prime factors.

4/5

Q5.Express 1750 as a product of its prime factors

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.Express 42 as a product of its prime factors

1/5

Q2.Express 144 as a product of its prime factors.

2/5

Q3.Express 80 as a product of its prime factors.

3/5

Q4.Express 35 x 10 as a product of its prime factors.

4/5

Q5.Express 1750 as a product of its prime 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.

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:

# Prime Deductions

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

Q1.75 = 15 x .....

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:

# Prime Deductions

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

Q1.75 = 15 x .....

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

# Lesson summary: Prime Deductions

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## Time to move!

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

For 5 mins...

Move around:
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On the spot:
Dance