Since 13 is a factor of 39, it is automatically the GCF.
GCF(13, 39) = 13.
It is: 13
The GCF of 13, 39 is 13.
The GCF is: 13
gcf(39, 91) = 13
The GCF is 13.
The GCF is 13.
GCF(39, 78, 26) = 13.
The GCF is 13.
It can be. 13 is the GCF of 26 and 39.
The GCF is 13.
The GCF is 13.
The GCF is 13.
The GCF is 13. 39=13*3 169=13*13