Braingenie - Web's most comprehensive math & science practice | Eclectic Technology | Scoop.it
Braingenie is the Web's most comprehensive math and science practice site. Popular among educators and families, Braingenie provides practice and video lessons in more than 4,000 skills.

* Learn, practice, and quiz yourself on 5,000+ skills.
* Compete in real-time multiplayer matches.
* Win badges and go for a top spot on the leaderboard.
And it is free!