The greatest common factor (GCF) is: 3
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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 greatest common factor of 6 and 36 is 6. Since 6 is a factor of 36, it is automatically the GCF.
The greatest common factor (GCF) is 3.