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You need at least two numbers to find a GCF.
A single number cannot have a greatest common factor - a greatest common factor (GCF) is used to compare two or more numbers.
3
The GCF is 3.
The GCF is 1.
The GCF is 17.
The GCF for 29 51 is 1.
The GCF of 42 and 51 is 3.
255 = 51 x 5 so 51 is GCF
The GCF of 39 and 51 is 3.3