funbrain  http://www.funbrain.com/numbers.html

Plus Math  http://www.aplusmath.com/games/index.html

I Know Math   http://www.iknowthat.com/com/L3?Area=L2_Math

multiplication .com

CoolMathForKids  

 Multiplication Practice

Geometry Workshop (I Know Math)

Primary Games   http://www.primarygames.com/math.htm

Harcourt Math  http://www.harcourtschool.com/activity/buzz/buzz.html