Khan Academy: Algebra: Multiplying and Simplifying Rational Expressions

Five out of four people have trouble with fractions! After comparing simplifying fractions to simplifying rational expressions, pupils use the same principles to multiply and divide rational expressions. 

In this algebra worksheet, learners simplify rational expressions using common denominators. There are 50 questions requiring factoring and grouping, with an answer key.

Provide your algebra class with some review of rational expressions in this video. Sal uses several sample problems to show viewers the process, and his explanations are clear and easy to understand.

Video lesson involving multiplying two rational expressions, simplifying the result and then stating the domain of the expression. [3:38]

Video shows examples of multiplying and dividing rational expressions. Includes adding restrictions to the simplified answer. [9:19]

Video lesson on multiplying rational expressions and simplifying the result by factoring the difference of squares. Includes stating the domain of the expression. [4:52]

Video lesson involving dividing rational expressions and simplifying the result by factoring out the greatest common factor. Includes stating the domain of the expression. [4:10]

Video showing how to add and subtract rational expressions by finding a common denominator and then simplifying the result. Also includes finding the domain of the result. [8:15]

Video shows example of adding and subtracting rational expressions. Includes discussion of using the least common multiple of the denominators for a common denominator. [2:56]

Sal explains what it means to simplify a rational expression and why we would want to do that. Just don't forget the excluded values! [15:22]