Question

Which of these numbers is a common factor of 54 and 81? 54 = 2 x 3 x 3 x 3 81 = 3 x 3 x 3 x 3 A) 2 B) 6 C) 9 D) 18

Answer 1

C) 9

Explanation:

54 = 2 x 3 x 3 x 3

81 = 3 x 3 x 3 x 3

common factor of 54 and 81 = 3 x 3 = 9

Answer: 9

Answer 2

C) 9

Explanation:

Note that the factors are already given to you:

54 = 2 * 3 * 3 * 3

81 = 3 * 3 * 3 * 3

Note that they all have 3 3's. However, there is not a choice for 27 (as 3 * 3 * 3 = 27), therefore, choose the next option: 3 * 3 = 9

C) 9 is your answer.

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