Adding Fractions with Unlike Denominators

Addition and Subtraction of Fractions
Introduction

Fractions are used to represent parts of a whole. When adding or subtracting fractions with unlike denominators, it is important to understand how to rewrite them ...

You are making a drink mix and pouring one-third cup of orange juice into a pitcher. Your sister adds one-fourth cup more.

To find how much is in the pitcher, you need to add 1/3 and 1/4. Since the denominators are different, you must first make them the same before adding.

The denominators are 3 and 4. The least common multiple of 3...