Any multiple of 15, like 15, 30, 45 and so on.
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The greatest common factor of 15 and 25 is 5 and so 5 divided into both numbers cancels them down to 3 and 5
3 and 5 both go into multiples of 15, as both numbers are factors of 15. In mathematical terms, 15 is a multiple of both 3 and 5 because it can be evenly divided by both numbers without leaving a remainder.
Numbers that have both 5 and 3 as factors are multiples of both 5 and 3, which means they are multiples of the least common multiple (LCM) of 5 and 3. The LCM of 5 and 3 is 15, so any multiple of 15 will have both 5 and 3 as factors. Examples of such numbers include 15, 30, 45, 60, and so on.
210. The greatest common factor (or GCF) is defined as the largest number that can be divided into two (or more numbers) and result in an integer answer (no remainder). To get the GCF, one factors the numbers involved and takes only the factors that both numbers share (the number of times that they are shared). 210 = 2 * 3 * 5 * 7 1260 = 2 * 2 * 3 * 3 * 5 * 7 Factors shared are 2, 3, 5 and 7, so 2*3*5*7 = 210.
The common factors are: 1, 5