Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Simplifying Rational Expressions
Twenty-seven problems present a variety of problems working with simplifying rational expressions. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View...
Help Algebra
Help algebra.com: Rational Expressions
In addition to defining rational expressions, this resource demonstrates how to find the excluded values and zeros of the expressions.
Interactive Mathematics
Interactive Mathematics: Multiplication & Division of Fractions
Starting with numerical expressions, this demonstration shows how to simplify algebraic expressions using multiplication and division. Examples are included for practicing the concept.