Question

find the hcf and lcm 20 and 120by prime factorisation. method

Answer 1

HCF of (20 and 120)-

20- 2x2x5
120- 2x6x2x5
HCF=2and5

LCM of (20 and 120)=2x2x5x6
=120
Therefore, the HCF is 2and5. And LCM is 120.