GCF of 64 and 40

Number 1Number 2(Optional) Enter Number 3

Determine the Greatest Common Factor (GCF) of (64,40)

Determine the factors for 64 up to 40 since that is the minimum of the 2 numbers
1,2,4,8,16,32

Determine the factors for 40 up to 40 since that is the minimum of the 2 numbers
1,2,4,5,8,10,20,40

The common factors between them are 1,2,4,8
The greatest common factor between them is 8
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