Badass link of the day
Math Facts
I have been using this website to quiz my kids. It does multiplication, addition, subtraction, and division. It allows you to review missed questions, set time limits, etc, etc...
My kids love it. I have my 3rd grader reviewing her addition facts, and my fifth graders doing multiplication tables to review (get them in the groove after the summer). After they get through the sequence, I will start them on subtraction and division.
They normally run 3 minutes tests and see how many they can answer correctly. They love it. I normally have to kick them off to let another kid have a go.