Math Online
Here are some fun and interesting websites providing you with games and activities.
http://www.wiu.edu/users/mfjro1/wiu/GAMESand/index.htm
http://classrooms.tacoma.k12.wa.us/stadium/eschlytter/index.php
http://www.gameaquarium.com/prealgebra.html
http://www.k111.k12.il.us/King/math.htm