The factors of 30 are:
1, 2, 3, 5, 6, 10, 15, 30
The factors of 45 are:
1, 3, 5, 9, 15, 45
The factors of 60 are:
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
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15 and 30 are factors of 60. The factors of 60 include the factors of 15 and 30. 45 is not a factor of 60.
45:1,3,5,9,15, and 45 60:1,2,3,4,5,6,10,12,15,20,30 and 60
Factors: 1, 3, 5, 15 Multiples: 15, 30, 45, 60, 75 and so on.
15, 30, 45, 60, 75, 90, 105 +15 . . .
The GCF is 15.