Question

What is the least common denominator for 5/8, 7/20, and 7/13

Answer 1

Answer is 520

Step by step

Perform Prime factorization for each denominator

8 = 2 x 2 x 2
20 = 5 x 2 x 2
13 = 13

List the primes in multiples for the times shown in the factorization

2 x 2 x 2 x 5 x 13 = 520

Check your work

520 / 8 = 65
520 / 20 = 26
520 / 13 = 40

Problem solved