In this video we explain two methods to find the highest common factor (greatest common factor) of two or more numbers: by listing the factors or by prime factorisation. Practice questions and answers are at the end of the video. This is an updated, 4K version of our previous video.
For a refresher on multiples and factors: https://youtu.be/4EkhaETrcnY
For a refresher on prime factors: https://youtu.be/1zagn5okZgM
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00:00 Introduction
00:23 What is a common factor and highest common factor
00:55 Method one: Listing the factors
01:18 Method two: Prime factorisation
01:50 Example using both methods
02:17 Practice questions and answers
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