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 GCF of 16 and 72 is 8. 16/72 can be reduced to 2/9
The GCF is 1.
The GCF is 2.
Since 16 is a factor of 32, it is automatically the GCF.
The gcf of 5 and 16 is 1