30, 45, 60, 75, 90 etc.
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The #s that go into 15 are----- 1,3,5,and 15
15 and 5 both go into every multiple of 15 .
15
12 and 15 go into the denominator 60. 1 and 3 go into 12 and 15.
No, they are factors of 15. Factors go into numbers, numbers go into multiples.