Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Add and Subtract Fractions
This Math Page tutorial explains how to add and subtract fractions and features a practice section at the very end of the lesson.
Visual Fractions
Visual Fractions: Multiply Fractions With Circles
Use circles to learn and practice multiplying fractions at this site from Visual Fractions. You will receive immediate feedback on each of your answers, and explanations are available for each question.