GCF of 256 and 64

Number 1Number 2(Optional) Enter Number 3

Determine the Greatest Common Factor (GCF) of (256,64)

Determine the factors for 256 up to 64 since that is the minimum of the 2 numbers
1,2,4,8,16,32,64

Determine the factors for 64 up to 64 since that is the minimum of the 2 numbers
1,2,4,8,16,32,64

The common factors between them are 1,2,4,8,16,32,64
The greatest common factor between them is 64
Since the Greatest Common Factor of both numbers ≠ 1, the numbers are not relatively prime (co-prime)
Since the Greatest Common Factor of Both Numbers is both ≠ 1 and have a difference of two, the numbers are not twin prime
To see the LCM of these numbers, click the LCM button above