The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.
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The Greatest Common Factor (GCF) is: 1
The Greatest Common Factor of 36, 45, 54: 9
The greatest common factor of 135 and 360 is 45
The GCF is 3.
The Greatest Common Factor (GCF) of 144, 45, and 18 is 9.