Common multiples

Problem:

common multiples

Solution:

Without further information, let me just show you a few examples.

For example, to find the common multiples of 10 and 15, you first find the least common multiple, which is 30, all multiples of 30 are then the common multiples of 10 and 15.

How do you find 30 out of 10 and 15, you find the greatest common factor first. The  greatest common factor is 5, so you divide 10 by 5 and 15 by 5 to get 2 and 3, you multiply 2 and 3 and 5 to get 30.