What is 1 7/12 - 3/20 equal to?

Question

I tried to do this question but I couldn't quite get the answer. For the directions of the work, its says use the least common multiple as the denominator and when I came across this one, I couldn't quite get the answer. If anyone, who knows the answer, can tell me and explain why and how to do it. Thanks!

Answer 1

The least common multiple of 12 and 20 is 60.

1 7/12 = 1 35/60

3/20 = 9/60

1 35/60 - 9/60 = 1 26/60 = 1 13/30

Answer 2

Thanks Ms.Sue for helping me!

Answer 3

You're welcome, Nat.