- Player A is the 'hider'. Player B is the 'finder'.
- Player A thinks of a mystery number and 'hides' it in the calculator by entering ÷ [mystery number] = .
Note: You may want to begin the game by limiting the choice to, say, 2-digit numbers.
- If clear is not pressed, the calculator is now set up to divide by the mystery number whenever = is pressed.
- Player B has to find the mystery number by entering [guess number] = .
Note: Some calculators show a ÷ sign when [guess number] is pressed to remind about the operation which has been entered.
- If the guess is correct, a special number (the Big 1) will appear on the screen. If the guess is not correct, it will provide information for the next guess.
- Without pressing clear Player B continues to enter [guess number] = until the Big One appears.
- Keep a record of each guess in your journal. It is also useful to comment on whether the guess was too big or small.
- Score one point for each try.
- Players swap roles. Winner is the player with the lower total score after, say, three (3) or five (5) rounds.
Player A pressed ÷ 3 = to hide the mystery number
and leave a zero (0) on the screen. Player B then
guessed 6 =. The calculator used the ÷ 3
stored in its 'brain' to get the answer 2.