What is the greatest common factor of 90 and 150?

Answer 1

The answer is 30, because it is the largest shared factor.

Answer 2

150 = 5 * 5 * 3 * 2

90 = 5 * 3 * 3 * 2

So: 5 x 3 x 2 = 30, the GCF

Answer 3

30