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 Common Denominator:  A whole number that is a common multiple of the denominators of two or more fractions.

All About Fractions at AAAmath.com: Learn how to add, compare, convert, reduce, multiply, divide, and subtract fractions. Try sample problems and obtain feedback.

Segfrac at Interactive Mathematics Server: Obtain practice with adding fractions with different denominators. You can try problems at various difficulty levels. Submit your answer and obtain feedback to each question.