Flip TEN-Fun addition card game from Guided Math! Flip two cards over. If the sum of the two cards equals they keep the cards and replace the cards with two more from the deck. The game ends when there are no more matches.
Clothespin Math on a clothes hanger! LOVE this. 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).