Khan Academy: Algebra: Adding and Subtracting Rational Expressions

This worksheet contains a good selection of problems of adding and subtracting rational expressions. There are eight problems. None of the problems have common denominators.  A few are mixed expressions and some require factoring....

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]

Video shows example of adding and subtracting rational expressions by creating a common denominator. [4:37]

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

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

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

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]

Rational expressions have never been so easy! Use this site to learn how to add and subtract them with ease and confidence. And common denominators? No Problem! Great practice problems are included to see how much you've learned.

A learning module through which students learn about rational expressions including inverse relationships, multiplying and dividing rations expressions, adding and subtracting rational expressions, solving rational equations, and...