Question

What is the least common multiple of 20 and 13?

Answer 1

`260`

Explanation:

When you need to find the lowest common multiple of two different numbers, in which one or both of them are prime, you can simply multiply them as long as the composite number is not a multiple of the prime.

We have 1 prime number `13`.
The number `20` is not a multiple of `13`

We can now just multiply them:

`lcm=13*20=260`

The lowest common multiple is `260`