Determine the greatest common factor for the pair of numbers.
-15, 54
A) 27
B) 3
C) 15
D) 81

Question

Quizplus · Accepted Answer

One way to find the greatest common factor is to list the factors of each number and find the greatest one they have in common. The factors of 15 are 1, 3, 5, and 15. The factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54. The greatest factor they have in common is 3, so the answer is B. The factors of 15 are 1, 3, 5, and 15. The factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54. The only factor that both numbers have in common is 3, so the greatest common factor is 3.

Determine the Greatest Common Factor for the Pair of Numbers