GCF means Greatest Common Factor, since the word 'common' is defined only when we deal with two or more than two things so we can't define the GCF of 65.
When we use the word common we compare the qualities or features of two or more than two things and find what similarity(ies) exist between them which we call 'common'.
The GCF is 5.
The GCF is 13.
The GCF is 5.
The GCF is 1.
The GCF is 65.
The GCF is 5.
The gcf of 260 and 325 is 65.
The GCF of 15 and 65 is 5.
GCF(58, 65) = 1
The GCF of 23 and 65 is 1.
The GCF of 65 and 75 is 5.
Since 5 is a factor of 65, it is automatically the GCF.