Curated OER
What's a Rational Expression?
A rational expression has a polynomial in the numerator as well as a polynomial in the denominator. The instructor writes out an example for you to see.
Loyola University Chicago
Math Flix: Compare Fractions With Same Denominators
This QuickTime movie provides an opportunity to compare fractions with the same denominator. As you watch and listen to the teacher and students interact it helps clarify this concept.
Khan Academy
Khan Academy: Comparing Fractions: Tape Diagram
Sal Khan compares fractions with unlike denominators by drawing bars