What are the multiples of 15 and 18?

The multiples of 15 are 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, and so on.

The multiples of 18 are 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, and so on.