Determine the Greatest Common Factor (GCF) of (72,81)

1,2,3,4,6,8,9,12,18,24,36,72

1,3,9,27

The common factors between them are 1,3,9

The greatest common factor between them is

Since the Greatest Common Factor of both numbers ≠ 1, the numbers are

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