What is the greatest common divisor of 72 and 18?

Answer 1

Prime factorization of 48 = 2 x 2 x 2 x 2 x 3

Prime factorization of 18 = 2 x 3 x 3

From the factorization of both numbers it is clear that 1, 2, 3 and 2x3 are common divisors. But 2x3 = 6 is the greatest among these, so GCD(48,18) = 6.

Answer 2

18 is a factor of 72 so 18 is the greatest common factor of 18 and 72.

Here are the multiples:

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

18 = 1 x 18 = 2 x 9 = 3 x 6

Answer 3

The Greatest Common Divisor of 72, 18 is 18.

Answer 4

Since 18 is a factor of 72, it is automatically the GCF.

Answer 5

18 = 2 x 3 x 3 42 = 2 x 3 x 7 Therefore the greatest common factor of these numbers is 2 x 3 = 6.

Answer 6

The GCF is 6.

Answer 7

The GCF is 6.

Answer 8

The GCF is 9.

Answer 9

18

Answer 10

It is 18