National Council of Teachers of Mathematics
The Math Forum: Student Center
The Math Forum Student Center provides math news, notes, challenges, and much more. Dr. Math is here with the answers to students' math questions. There's a teachers' section, a research division, and a parents' part. This site also...
Ducksters
Ducksters: Math, History, Science Homework Help and Practice Questions
Homework help for kids on subjects like geography, math, history, social studies, and science. Lots of practice questions.