Question

What is the least common multiple of 14 and 21?

Answer 1

`42`

Explanation:

The prime factorisations of `14` and `21` are:

`14 = 2 xx 7`

`21 = 3 xx 7`

So the smallest number that contains all of these factors is:

`42 = 2 xx 3 xx 7 = 3 xx 14 = 2 xx 21`