Question

Find the LCM of 6 and 21

Answer 1

We find the factors of 6 & 21 by Prime Factorisation Method:
6 = 2 × 3
21 = 3 × 7

Hence, L.C.M. of the 6 & 21 is :
2 × 3 × 7
= 42 ( Required L.C.M.)

Answer 2

First of all we have to factorize 6 and 21
Factorized form of 6=2*3
Factorized form of 21=7*3

Hence LCM of 6 and 21,
it is 2*3*7 which multiplies 42.