Here are some mathematics links you might find helpful and/or fun.  Please let me know if you have other sites you find useful.

www.cpm.org

  

Various games with negative numbers (requires Java)

 

Tic Tac Toe with Negative numbers (requires Java)

 

Sketchpad adding+subtracting graphics

 

Multiplication using partial products

 

Illuminations activities from NCTM Illuminations

 

Math Facts Worksheet

 

Math Dictionary

 

        Math Fact Generator

 

        Math Jokes

 

Google Sketchup Download