# Lowest common multiple and prime factors

In this lesson, we will use prime factorisation to identify common multiples and the lowest common multiple. We will also use Venn diagrams to sort prime factors.

#### 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.Find the lowest common multiple of 3 and 6

1/5

Q2.Find the highest common factors of 3 and 6

2/5

Q3.Find the LCM of 14 and 21

3/5

Q4.A pair of numbers have LCM OF 24. What could the pair of numbers be?

4/5

Q5.Zaki says that 2 prime numbers LCM is found by multiplying the prime numbers together, Is this true or false?

5/5

#### 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.Find the lowest common multiple of 3 and 6

1/5

Q2.Find the highest common factors of 3 and 6

2/5

Q3.Find the LCM of 14 and 21

3/5

Q4.A pair of numbers have LCM OF 24. What could the pair of numbers be?

4/5

Q5.Zaki says that 2 prime numbers LCM is found by multiplying the prime numbers together, Is this true or false?

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.

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

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

# LCM and prime factors quiz

Show what you've learnt!

Q1.Fill in the gaps, in the correct order: Writing numbers as a __________ of their _______ factors helps you to find the lowest common multiple.

1/5

Q2.The Venn diagram shows the prime factors of 60 and 84. Write 60 as a product of its prime factors.

2/5

Q3.The Venn diagram shows the prime factors of 60 and 84. Write 84 as a product of its prime factors.

3/5

Q4.The Venn diagram shows the prime factors of 60 and 84. Which calculation represents the LCM of 60 and 84?

4/5

Q5.The Venn diagram shows the prime factors of 60 and 84. What is the LCM of 60 and 84?

5/5

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

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

# LCM and prime factors quiz

Show what you've learnt!

Q1.Fill in the gaps, in the correct order: Writing numbers as a __________ of their _______ factors helps you to find the lowest common multiple.

1/5

Q2.The Venn diagram shows the prime factors of 60 and 84. Write 60 as a product of its prime factors.

2/5

Q3.The Venn diagram shows the prime factors of 60 and 84. Write 84 as a product of its prime factors.

3/5

Q4.The Venn diagram shows the prime factors of 60 and 84. Which calculation represents the LCM of 60 and 84?

4/5

Q5.The Venn diagram shows the prime factors of 60 and 84. What is the LCM of 60 and 84?

5/5

# Lesson summary: Lowest common multiple and prime factors

## 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