Gives step by step descriptions on how to simplify different types of rational expressions.
James Brennan

A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes

Quiz on Rational Expressions, Quadratic Equations, and Roots
SOS Math

Tutorial on Simplifying Rational Expressions. Fundamental Principle of Rational Expressions. Simplifying (or reducing) a Rational Expression. Practice Problems
Virtual Math Lab

Discussion of rational expressions and detailed explanation of several examples
Paul's Online Math Notes

Examples of rational expressions that are ratios of two polynomial expressions.
Department of Mathematics  College of Science  University of Utah
