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To add or subtract fractions, they must have the same denominator. If they do not, make the least common multiple of all of the denominators the new denominator. After adding or subtracting, reduce your answer.
When giving the fractions like denominators, whatever number you multiply the old denominator of a fraction by, you must also multiply it by the numerator.

This prealgebra lesson explains how to add and subtract fractions when the denominators are different.

Practice adding fractions that have different denominators.

You don't necessarily have to find the least common denominator to get the correct result, you can just find a common denominator. But the math will be easier ...

May 2, 2012 ... Adding fractions with different denominators, step by step, examples. For more free math videos visit http://MathMeeting.com.

Master this simple trick for adding fractions with different or unlike denominators.

Fun math practice! Improve your skills with free problems in 'Add fractions with unlike denominators' and thousands of other practice lessons.