The common multiples of 3 and 15 are 15, 30, 45, 60, 75, 90, 105, and so on. The LCM of 3 and 15 is 15
There is an infinite number of common multiples for 15 and 3. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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An example of a common multiple of 3 and 15 would be 15itself. This is also the least common multiple (LCM).