GameQuarium  This site has super games that let your practice your new math skills.  It's actually FUN.

Prealgebra Thinkquest   This site has tutorials and examples, complete with a message board.

Learning Wave   Excellent explanation of signed numbers and absolute value.

Adding Integers    Practice adding negative and mixed numbers with interactive exercises.

Make your own graph paper, even numberlines and music staffs.

Super Numberline    Terrific JAVA applet showing how to use the numberline to add and subtract.

Glossary of math terms.

Prime number calculator.

Basic percent calculator.

Terrific math anxiety page; lots of good suggestions.

Free Sudoku games.

Practice solving equations interactively.  Start at prealgebra and work up to intermediate algebra.

Interactive equation balance scale (uses only positive integers).

Better Interactive Equation Balance Scale  (also uses only positive integers, but allows subtraction in original equation).

Cartesian Plane with interactive activities from Langara College in Canada.

Rates of change as cost per minute interactive worksheet.