3, 6, 9, 12, 15
15, 30, and 45 are.
30, 60, 90
5, 10, 15, 20, 25
They are infinite. The first five are: 11, 22, 33, 44, 55.
20, 40, 60.
30, 60, 90
What are the first three common multiples of four and five
105, 110, 115, 120, 125
9, 18, 27, 36, 45
7, 14, 21, 28, 35
4, 8, 12, 16, 20