Finding the LCM

A lesson to find the LCM using Venn diagrams and Prime 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!

Question 1

Question 2

Question 3

Question 4

Q1.18 is a multiple of 6?

1/4

Q2.Find the HCF and the LCM of 6 and 15.

2/4

Q3.You can find the LCM of any 2 numbers by multiplying them together!

3/4

Q4.A green light flashes every 15 minutes and a red light flashes every 50 minutes. If they start to flash at the same time, after how long will they both flash together?

4/4

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!

Question 1

Question 2

Question 3

Question 4

Q1.18 is a multiple of 6?

1/4

Q2.Find the HCF and the LCM of 6 and 15.

2/4

Q3.You can find the LCM of any 2 numbers by multiplying them together!

3/4

Q4.A green light flashes every 15 minutes and a red light flashes every 50 minutes. If they start to flash at the same time, after how long will they both flash together?

4/4

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:

Finding the LCM

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

Question 1

Question 2

Question 3

Question 4

Q1.

1/4

Q2.The Venn diagram shows the product of primes for numbers A and B. What is the value of B?

2/4

Q3.The Venn diagram shows the product of primes for numbers A and B. What is the LCM of these two numbers?

3/4

Q4.Find the LCM of 38 and 42.

4/4

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:

Finding the LCM

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

Question 1

Question 2

Question 3

Question 4

Q1.

1/4

Q2.The Venn diagram shows the product of primes for numbers A and B. What is the value of B?

2/4

Q3.The Venn diagram shows the product of primes for numbers A and B. What is the LCM of these two numbers?

3/4

Q4.Find the LCM of 38 and 42.

4/4

Lesson summary: Finding the LCM

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The next lesson in HCF and LCM is "Finding the HCF"

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