What is the greatest common factor of 30 and 324?

Answer 1

Since 225 is odd, it can't have any even factors.

Since the sum of its digits (2+2+5)=9 is divisible by 3, 225 is divisible by 3.

Factors of 24: 1, 2, 3, 4, 6, 8, 12, and 24

Since 3 is a factor of 24 and the only odd factor of 24, that must be the common factor.

Since it's the only common factor, it's also the greatest one.

Answer 2

Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24

Factors of 225: 1, 3, 5, 9, 15, 25, 45, 75, 225

The GCF of 24 and 225 is 3.

Answer 3

The greatest common factor of 30 and 324 is 6.

Answer 4

The GCF is 9.

Answer 5

The GCF is 18.

Answer 6

45