National Security Agency
Fraction Fever
This unit on fractions allows for upper-aged elementary learners to explore ways to find the greatest common factor and least common multiple of two numbers. Ultimately, young mathematicians will be able to identify equivalent fractions,...
Other
Help With Fractions: Adding Fractions
The rules for adding fractions with the same or different denominators are clearly explained at this website. This is an excellent place to get step by step explanations for working with fractions.
AAA Math
Aaa Math: Adding Fractions With Different Denominators
This personal site explains how to add fractions with different denominators by finding the least common denominator. Gives problems and games to practice this skill.
Other
Project Happy Child: Adding Fractions Story & Worksheets
Miss Walker explains to Bart the fine details of adding fractions. At the end of the discourse is a link, "Return to Fractions index," where you can go to print off some practice sheets.
Learning Wave Communications
Learning Wave: Fractions
This resource contains information about fractions and includes ratios, equivalent fractions, basic operations, and reciprocals. Several links for practice problems are also included, along with links to a post and pretest.
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.
Help Algebra
Help algebra.com: Fractions
This resource offers an overview of fractions from several aspects, including simplifying, reduced, mixed numbers and improper form, and basic operations. Examples and diagrams are included to help demonstrate each topic.
BBC
Bb Ci: Operations With Fractions Review
This BBC test prep review ("revision") section includes reminders and practice in adding, subtracting, multiplying, and dividing fractions. Clicking "Test Bite" on the last page will get you a short interactive quiz over the material.