Mathematics
Fun Stuff
Cut the Knot
Interactive Mathematics Miscellany and Puzzles. Provides a variety of activities for students and teachers. Applicable for basic arithmetic, algebra, geometry, probability, calculus and more. The activities are interactive and many of them use java applets.
URL: http://www.cut-the-knot.org/
Cool Math Sites
Contains web sites and links for games, puzzles, brain teasers, testing and calculator sites for pre-algebra through calculus.
URL: http://cte.jhu.edu/techacademy/web/2000/heal/mathsites.htm
Math Puzzle
Contains a variety of math puzzles either available online for instant playing or for download.
URL: http://www.mathpuzzle.com/
Shodar: Interactivate
Contains interactive activities for beginning mathematics including geometry, algebra, probability and statistics.