## Basic College Mathematics (9th Edition)

Published by Pearson

# Chapter 3 - Adding and Subtracting Fractions - 3.3 Adding and Subtracting Unlike Fractions - 3.3 Exercises: 2

#### Answer

least common denominator

#### Work Step by Step

To rewrite unlike fractions as like fractions, we must find the least common denominator (or the denominator that is the least common multiple of the original denominators) of the unlike fractions. For example, if we want to add $\frac{3}{8}$ and $\frac{1}{4}$, we must find the least common multiple of 4 and 8. We know that this is 8. Therefore, we can rewrite this pair as like fractions. $\frac{3}{8}+\frac{1}{4}=\frac{3}{8}+\frac{1\times2}{4\times2}=\frac{3}{8}+\frac{2}{8}=\frac{3+2}{8}=\frac{5}{8}$

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