Question

Which of the following is a common denominator of 1/4 and 5/6? Answers:

A: 8
B: 9
C: 12
D: 15

Answer 1

C, 12

Explanation:

least common multiple of 4 and 6 is:

prime factorization of 4: 2*2

prime factorization of 6: 3*2

common factors: 2, so you should only multiply one of the common 2s when multiplying the factors to get the least common multiple

2*2*3=12

12 is a common denominator of 1/4 and 5/6