What is the greatest common factor of 225 and 420?

Answer 1

The factors of 225 are:

1, 3, 5, 9, 15, 25, 45, 75, 225

The factors of 420 are:

1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420

The common factors are:

1, 3, 5, 15

The Greatest Common Factor (GCF) is: 15

Answer 2

The common factors of 210 and 420 are: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210

Answer 3

Since 15 is a factor of 210, all of its factors are common.