45, 48, 51, 54, 57, and 60 are.
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15 30 45 60 75 90
15, 30 & 45
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
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 only number between 3 and 45 which is a factor of 3 is 3. There are several multiples of 3 beyond this.