fractions
MangaHigh - Cool, Free Middle School & High School Math Games
Here's a find-- free, online games to help kids learn upper level math and mathematical thinking. Emphasizes getting the correct answer quickly, and the games are challenging.
Topics include Algebra, Geometry, Trigonometry, Estimation, Times Tables, Fractions, Decimals...
Math Live, online animated math tutorials from LearnAlberta.CA
This free site features 23 different interactive tutorials on a range of math concepts. The focus is on understanding concepts, not drill. The tutorials are "taught" by friendly animated characters-- it's not as fun as Cyberchase, but it's not too dry either.
The topics covered are: decimals, fractions, basic geometry, plotting points on an XY coordinate system, and probability. If there's a topic that your child isn't getting or is resistant to being taught, this could be a helpful site.
Arcademic Skill Builders
Arcademic Skill Builders are research-based and standards-aligned educational games that offer an innovative approach to teaching basic academic skills. We incorporate features of arcade games and educational practices into fun online games that will engage, motivate, and teach your kids.