First add 15 and 45. Then find the factors.
15+45=60
The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.
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Since 15 is a factor of 45, and 15's largest factor cannot be larger than itself, the greatest common factor of 15 and 45 is 15.
The greatest common factor of 45 and 105 is 15.
3 is a factor and dividing by 3 gives x + 15 = 8x
15 and 15000 have a greatest common factor of 15
The greatest common factor of 45 and 225 is 15.The GCF is: 45