I don't know if it's been suggested already, but my kids had a blast working on Math Kangaroo problems. They are more problem-solving than calculation type problems. There are several grade levels of sample problems to work on:

http://www.mathkangaroo.org/

My kids also like to practice math facts using this gadget:

http://www.flashmaster.com/

Oh, I just wanted to add that this is a great article on how to teach multiplication:

http://www.visualspatial.org/Articles/mthstrat.pdf

Your son will see that there really is not that much to memorize!


HTH!

Cathy

Last edited by Cathy A; 01/27/08 08:38 PM.