They are the six multiples of 15.
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The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
15,30,45,60,75,90
The common multiples of 3 and 15 in the numbers 1-100: 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 LCM of 3 and 5 is 15. The multiples of 3 are , 6, 9, 12, 15, and so on. The multiples of 5 are 5, 10, 15, and so on. The LCM is 15.