A spectator chooses a card, looks at it and returns it to the pack. The magician states that he will find the position of the card by mathematics. He takes out a pocket calculator. The calculator will not work. The magician apologises and hands the pack to the spectator asking him to remove his card and he will attempt another effect. The spectator cannot find the card. The magician offers to try and fix the calculator so that the whereabouts of the chosen card can be worked out. On removing the back of the calculator a folded card is seen inside: The card is thrown to the spectator with the comment, "That was gumming up the works!" The magician seems more interested in the calculator, which now works. The spectator finds the folded card to be the one that he chose.


You need a pack of cards, from which you decide the one that you are going to force. You then need a duplicate of the force card, and a pocket calculator. The calculator I originally used was a small Cambridge Sinclair. The force card, folded up, fits in the space next to the batteries. I now use a bigger Sharp EL-211.

There is no need to fold the card, but I put one fold in it anyway. Place the duplicate of the force card inside the calculator, and put the calculator in your pocket.

With cards in hand, pick a willing victim and force your card on him. When the card is replaced, control it to the top. Patter about finding the card by mathematics and palm it off. The hand, with card palmed, goes to the pocket. It leaves the card there, as it removes the calculator. The calculator is tilted towards yourself and you press any button but the "on" button. You now key in 52 and 1 muttering to yourself "52 cards in the pack — 1 card chosen. Oh! It's not working!" The rest is as described at the beginning; a look through the pack finds the card missing. You discover it inside the calculator.

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