Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface.
Welcome to Math Playground, an action-packed site for elementary and middle school students. Practice your math skills, play a logic game and have some fun!
KidsNumbers.com is the absolutely free math resource designed by teachers, specifically for students and children of all ages. A place where students can practice all aspects of math, including addition, subtraction, multiplication, and division, in a fun and pressure free way.