posted by carrie on .
A student asks about the relation between least common multiple and least common denominator. How do yourespond?
When you're adding or subtracting fractions, you need to find the least common denominator.
1/2 + 3/4 + 5/8 = 4/8 + 6/8 + 5/8 = 15/8
The least common denominator is also the least common multiple. In the above problem that is 8.