http://www.aplusmath.com/Games/index.html
http://www.puzzlechoice.com/pc/Brainboxx.html
http://www.funbrain.com/brain/MathBrain/MathBrain.html
http://www.jigzone.com/
http://www.coolmath4kids.com/
http://www.brainpop.com/
http://www.senselang.com/
http://www.mathsyear2000.org/
Sudoku http://www.websudoku.com/