I used this site: http://multiplication.com/flashcards.htm for flashcards. I cut them out and put them into travel soap boxes for the kids to take home. I also put a small slip of paper in the box for parents to sign and date each day so I can see if they are practicing.
Xtramath.com is a great online site to use to practice math facts. It is completely free! The kids can use it at home and at school. It starts the kids out with addition facts, but you can change it to any operation. My class is enjoying it and many are doing it at home, too.