Clothespin Math on a clothes hanger! Easy to make, and self explanatory. I'm thinking a wire clothes hanger would work better, so the clothes pins are easy to slide back and forth (almost like an abacus).
"Multiplication color by number (lots of varieties) This is an online activity that would be great for early finishers, or for kids who need extra math practice!" :: Some of my young grands are just plain smart, and like fun stuff like this!