http://www.coolmath-games.com/arithmattack/index.html
http://www.mathmastery.com/cyberchallenge/
http://www.funbrain.com/math/
http://www.kidport.com/Grade2/Math/MathIndex.htm
http://www.aplusmath.com/cgi-bin/games/addpicture
http://www.playtolearn.com/coins.asp
http://www.aplusmath.com/cgi-bin/games/addpicture
http://www.arcytech.org/java/money/money.html