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 ...

The only common prime factor is 3, so 3 is the HCF of 120 and 63 ... Find the HCF of the numbers by multiplying the numbers in the intersection. Find the LCM of the numbers by multiplying the ...