Math
MANY multiplication games (click on the highlighted phrase)
http://www.starrmatica.com/standalone/starrMaticaplaveValueMysteryNumbers.swf (place value to millions)
http://www.fun4thebrain.com/addition.html - Not only are these games fun, but they are so cute! Check out those adorable penguins!
http://www.softschools.com/math/games/fishing_sub.jsp - Going fishing? In this game, you have to know your subtraction facts before the fish can get away!
http://www.aplusmath.com/games/index.html - You can choose whether you want to practice addition or subtraction with these games.
http://www.coolmath-games.com/Timernator/Timernator-subtraction.html - Can you answer all the subtraction problems before time runs out?
http://themathworksheetsite.com/ - You can print off your own practice sheets using this website.