Divide both by their highest common factor.
78 and 64's highest common factor is two.
64 and 40's highest common factor is eight.
the least common factor and only common factor of 9, 36, and 64 is 1.
The Greatest Common Factor of 24, 36, 64: 4
The highest common factor of 64 and 56 is 8
The greatest common factor of the numbers 39 and 64 is 1.
The Highest Common Factor is: 8
The GCF of 36 and 64 is 4. 36/64 = 9/16
The GCF of 18, 36, and 64 is 2
The GCF of 24 36 64 is 4.
The highest common factor of 48 64 and 80 is 16.