This worksheet is an interactive webpage that will guide you through the addition of fractions with unlike denominators.

Fractions can only be added correctly when both fractions have the same denominator. When the fractions do not have the same denominator, you must find a common demoninator for both of the fractions. In order to find this common denominator, you can make lists of the multiples of both fractions' denominators. The smallest multiple found in both lists is the least common denominator, or LCD. This number will be the new denominator for both fractions.

You must convert both fractions to the equivalent fraction with the new denominator.



Try this problem:
Find the LCM (Least Common Multiple) of
 
Now adjust the numerators:





Now Add the Numerators and input the final answer: