45
1*45 = 45
3*15 = 45
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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 common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
15, 30, 45, etc.
15, 30, and 45
15, 30 & 45