Area math game: Roll the dice and draw the area array on your own grid - first to fill it wins. Or 2 players choose a different coloured pen each, use one grid and the player who cannot complete the last array is the loser. Like it!
Game: true/false math facts I would use this when teaching about adding multiple numbers. I would have students do this in math centers. I really like how students have to work out all of the problems and then decide if they are true or false.