Students play with a 2 decks of cards (1-10). The take turns flipping over the cards and making the statement, "I know that double ____ is ____, and _____ plus 1 equals _____." The double is then crossed off on a number grid given to share between partners with an X or an O. The students then follow tic-tac-toe rules to find a winner of the game. This worksheet goes along with the game.