Learn how to work out the factors of a number using a diagrammatic representation and factor trees in this KS3 maths study guide from BBC Bitesize.

Sometimes you are given numbers expressed as a product of prime factors. For example, 8 = 2 3 and 90 = 2 × 3 2 × 5. If you want to find the LCM and HCF in an exam, we can use prime factor form ...