Question

Which number is a common factor of 27 and 45?
A) 5
B) 9
C) 12
D) 15

Answer 1

9 is the common factor of both 27 and 45 cause 9 * 5 is 45 and 9*3 is 27

Answer 2

We found the factors and prime factorization of 27 and 45. The biggest common factor number is the GCF number. So the greatest common factor 27 and 45 is 9.

Explanation: