You need at least two numbers to find a GCF.
The greatest common factor of 40 and 65 is 5
The Greatest Common Factor of 41, 38: 1
8
The GCF is 10.
The greatest common factor of 40x2 and 20x7 is 20x2
The GCF is: 8
Three
The greatest factor of any positive number is the number itself. The greatest common factor of 38 and 49 is 1.
The GCF is 4.
The GCF is 4.
The GCF is 1.
The GCF is 9.