The GCF is 2.
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the greatest common factor is 6
The greatest common factor of 42 and 66 is 6.6
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.
The GCF of 12, 28, 50, and 54 is 2.
The greatest common factor of 6 and 36 is 6. Since 6 is a factor of 36, it is automatically the GCF.