It is not possible to give a sensible answer to this question. 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!
You need at least two terms to find a GCF.
The GCF is 2x.
The GCF is 4.
The GCF of 8x and 12 is 4.
4
The GCF of 4, 8 and 9 is 1.
The GCF is 4.
The GCF of 4, 8 and 12 is 4.
The GCF is 2.
The GCF is 4.
The GCF is 16.
The GCF is 4.
The GCF is 8.
The GCF is 4.
The GCF is 4.
The GCf is 4.
The GCF of 8, 20, and 36 is 4.