By student demand, AAAAAADD!!! (like AHHHH!!! + Add) My small groups love playing the sight word and phonics versions of this game, they asked me to make a math version!
Players take turns picking a card. If they can solve the problem they keep the card, if not, they put it back.
When they get the "AAAAAADD!!!" card, they put ALL their cards back (alternately you can just have them put back 2).
Infinite play: Return the "AAAAAADD!!!!" cards to the pile
Limited play: Return fact cards to the pile, but keep AAAAAADD!!! cards separate and keep out of play.