Add Like Mad
www.weeklyreader.com/kids/games/add.asp
Counting Money
http://www.hbschool.com/activity/counting_money/
Math Flashcards
http://www.factmonster.com/math/flashcards.html
Math Magician (addition)
http://www.oswego.org/ocsd-web/games/Mathmagician/mathsadd.html
Math Magician (subtraction)
http://www.oswego.org/ocsd-web/games/Mathmagician/mathssub.html
Everday Math Games
http://www1.center.k12.mo.us/Edtech/edm/1.htm
That's a Fact
http://www.harcourtschool.com/activity/thats_a_fact/english_4_6.html