the common multiples are the same number in 2 groups of multiplication, like as an example.
the common multiples of 3 and 6, you would have to write them first.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, and ect.
6, 12, 18, 24, 30, 36, 42, 49, 55, 61, and ect.
and the common multiples would be 6, 12, 18, 24, 30, and ect.