Houghton Mifflin Harcourt
Houghton Mifflin Harcourt: Saxon Activity Center: Graphing Calculator Activity: Common Denominators [Pdf]
A graphing calculator lesson focusing on common denominator. Lesson contains detailed examples, visual demonstrations with key functions, and practice problems. Acrobat Reader required.
Paul Dawkins
Paul's Online Notes: Rational Expressions: Practice Problems
Practice exercise reviews how to reduce a rational expression to lowest terms and how to add, subtract, multiply and divide rational expressions.
CK-12 Foundation
Ck 12: Algebra: Excluded Values for Rational Expressions
[Free Registration/Login may be required to access all resource tools.] Reduce rational expressions involving fractions to simplest terms and find their excluded values.
Khan Academy
Khan Academy: Intro to Rational Expressions
This lesson will introduce you to rational expressions. You will learn how to determine when a rational expression is undefined and how to find its domain.
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