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 to ...

Refresh your knowledge with these guides on factor trees and writing numbers as a product of prime factors. List the factors of each number. Compare the lists to find the greatest number common to ...