How to find the Lowest Common Multiple (LCM) (2026/27 exams)

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** WHAT'S COVERED **
1. Definition of the Least Common Multiple (LCM)
Also known as the Lowest Common Multiple.
2. Finding the LCM by Listing Multiples
How to list the multiples of each number.
Identifying the smallest number appearing in all lists.
Explanation of why simply multiplying the numbers doesn't always give the LCM.
3. Finding the LCM using Prime Factors

** EXAM BOARD INFO **
Suitable for courses across the world, including all KS3 and GCSE courses in the UK.

** CHAPTERS **
0:00 What is the Least Common Multiple (LCM)?
0:25 Method 1: Finding LCM by Listing Multiples (Example: 6 and 10)
1:28 Common Multiples vs Lowest Common Multiple
2:04 Method 1 Example: LCM of 5 and 8
2:46 Method 2: Finding LCM using Prime Factors - Introduction
3:00 Method 2 Example: LCM of 28 and 42
4:39 Method 2 Example: LCM of 132 and 420

** PLAYLISTS **
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