15, 30, 45
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15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
Since the lowest common multiple of 3 and 5 is 15, the common multiples of 3 and 5 are the multiples of 15: 30, 45, 60, 75, 90, etc...
The way to solve this is as follows:Find the least common multiple of the two numbers.Multiply this least common multiple by 2 and by 3, to get the next two common multiples.
They are the six multiples of 15.
There are more than 5 multiples of three, but here are the first 5: * 6 * 9 * 12 * 15 * 18