Players take turns flipping over one card of each color. If the solution matches the problem, the player keeps the cards and goes again. Otherwise, the cards are turned back over and it's the next player's turn. Remind students to check each other's work to help them catch any errors they may make. On-Line Computer Game Put a multiple choice worksheet into a game on the Quia web site.
Students can work alone or in pairs.
Put one worksheet on the table between the players. The first player picks a problem, and the second player picks a problem that she thinks will give an answer greater than the first player's answer. Then they each do the problem they pick and check each other's work. The player with the largest answer scores a point. Continue until all of the problems have been done.