Who Wants To Be A Millionaire? http://www.millionairetv.com/
Keep the Change http://www.kidsnumbers.com/keep_the_change.php
Arcade Games http://www.funbrain.com/brain/JustForFunBrain/JustForFunBrain.html
Number drop Test your skills on +, -, x, /
Shooting Hoops http://kids.yahoo.com/games/game/quickshot
Lemonade Stand http://4webgames.com/lemonade/singleplayer/play.php
Magic Squares http://www.allmath.com/magicsquare.php
Puzzler's Paradise http://www.puzzlersparadise.com/
Math Games - Includes factor games in a format like Tetris as well as a race game and one for coordinate graphing:) http://hotmath.com/games.html
Connect Four http://www.mathsisfun.com/games/connect4.html
Math Games and Practice Skills http://www.coolmath4kids.com