Click on this site: http://www.mathcats.com/index.html#contents
it's mathcats.com it has wonderful 'flash cards' with math facts on them and
it's all printable. Just cut out and it even has a "fact family house" pattern to
hold and store your cards as you test the kids.
also-http://www.mathfactcafe.com/view/view.aspx?t=P&g=1
mathfactcafe.com
-lots of printable pages for math problems