You need at least two numbers to find a GCF.
8 and 12 have a GCF of 4.
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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 68 and 480 is 4.
The greatest common factor of 4 and 5 is 1. The GCF of any consecutive integers is 1.
The greatest common factor of the numbers 3, 4, 8 and 9 is 1.
24
The greatest common factor of the numbers 430 and 4 is 2.