This math topic focuses on the skill of finding the lowest common denominator (LCD) to aid in the addition of fractions with different denominators. There are seven problems provided which present pairs of fractions, and the challenge is to identify the correct LCD that would be used to add each pair. Multiple choice answers are given for each problem, testing the ability to accurately calculate or determine the least common multiple of denominators, central in simplifying addition of fractions. This topic is part of a broader unit on mixed fraction addition and subtraction.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.