15 and 30 have a GCF of 15. There are other such pairs.
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Since 5 is a factor of 15, it is automatically the greatest common factor of the pair.
The greatest common factor of 15 and 105 is 15.
Since 15 is a factor of 60, it is automatically the GCF.
The greatest common factor (GCF) is: 5.
The greatest common factor of 135 and 300 is 15.