Web sites
Cool Math.com -- Lots of great math games and help with algebra, fractions and decimals.
Ask Dr. Math  -- Hundreds of math questions and answers for middle school students.
The History of Mathematics -- Lots of links to sites with facts about math in ancient times, geometry and famous mathematicians.
The Math Forum Student Center-- Math homework help, plus problems, puzzles and work by other students.
Math Stories - Word problems for students, teachers and parents.
Webmath-- Instant help with those tricky math problems.
Middle School Math -- Links to all sorts of useful math sites.

Web sites
AAAMath -- Practice problems and games organized by topic and grade level.
Brain Teasers -- Test your wits each week with a new math puzzle.
Coolmath.com -- Fully interactive site for sharpening math skills.
Math Cats -- Stresses logic and beauty of math, provides games crafts and interactive projects.
Math Dictionary for Kids -- Interactive dictionary with a variety of visuals.
Math Stories - Word problems for students, teachers and parents.