Computer lab games
http://www.math-play.com/Middle-School-Math-Games.html
http://www.physicsgames.com
http://www.mathplayground.com/games2.html
http://www.funbrain.com/brain/MathBrain/MathBrain.html
http://www.knowledgeadventure.com/subject/math-games.aspx
http://www.sheppardsoftware.com/math.htm#prealgebra
http://prongo.com/games/ages9-12.html
http://www.physicsgames.com
http://www.mathplayground.com/games2.html
http://www.funbrain.com/brain/MathBrain/MathBrain.html
http://www.knowledgeadventure.com/subject/math-games.aspx
http://www.sheppardsoftware.com/math.htm#prealgebra
http://prongo.com/games/ages9-12.html