If you get the answer right, you get to keep the card. If you get the answer wrong, Mommy gets to keep the card. Who do you suppose won the game?
On a side note: I have not drilled addition with him at all, and have only ever played this game with him once. He hasn't done math workbooks. He has, however, talked about math ideas, played with counting blocks, and listened to his sister drill math a little bit. He also asks constant questions. It's like he's a little learning machine. I have to ask him to stop learning and put on his shoes at times. I love unschooling!