Question

Find the greatest common factor (GCF) of 60, 78, and

66.

10

5

13

6

Answer 1

6

Explanation:

Prime factorization of 60: 2 • 2 • 3 • 5

Prime factorization of 78: 2 • 3 • 13

Prime factorization of 66: 2• 3• 11

Common factors = 2* 3 = 6

Answer 2

The greatest common factor is 6