Pre Algebra
Mail Algebra
http://www.bbc.co.uk/education/mathsfile/shockwave/games/postie.html
Balanced Expressions Practice
http://www.vectorkids.com/vkvariable.htm
Guess the Number!
http://www.funbrain.com/guess2/index.html
Lemonade Stand
http://www.coolmath-games.com/lemonade/index.html
Coffee Shop!
http://www.coolmath-games.com/0-coffee-shop/index.html