Online Flash Cards http://www.oswego.org/ocsd-web/games/mathmagician/maths1.html
National Library of Virtual Manipulatives Tangrams, etc. http://matti.usu.edu/nlvm/nav/grade_g_3.html
Math Games http://www.coolmath4kids.com/
More Math Games http://www.aplusmath.com
Pre-Algebra Online Textbook User ID: prealg05; Password: ph5ves7a http://www.glencoe.com/sec/math/ose/index.html
Tour-de-Math http://www.fi.edu/pieces/silverman/TourDeMath.html
March Madness http://www.madison.k12.ky.us/district/projects/WebQuest/MarchMadness/mmwebquest.html