You need at least two numbers to find something in common. If that's 12 and 15, the answer is 3.
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The Greatest Common Factor (GCF) is: 1
The Greatest Common Factor (GCF) is: 6
the greatest common factor of 55 and 75 is 5
The greatest common factor of 135 and 360 is 45
The greatest common factor of 147 and 36 is 3.