## The Calculator Card Trick

Fig. 69

Fig. 69

The trick is immediately repeated and the calculator is once again correct.

Method: The only preparation is to note and remember the top card of the deck. In the above example this card is a seven-spot. Have the spectator cut off a packet of cards onto your palm. Then turn up the top card of packet B. Whatever its value, mentally add this to the card you memorized. In our example the top card of B is an eight, so you would silently add eight and seven, getting 15. Say to the spectator, "Suppose I had 15 dollars {here you name the total of the two numbers) and gave you eight {here you point to the eight-spot he cut to]. How much would I have left?" When he says, "Seven," simply turn up the top card of A to show it is a seven.

The trick is over so quickly that the spectator will ask you to do it again. J. W. Sarles devised this ending. Beforehand you note both the top card and the bottom card of the deck. Assume the bottom card is a three-spot.

Do .the first pa« of the trick as described above. Then put packet A back on top of packet B. Say, "It works with other problems too. Here, cut the deck again." Once more the deck is placed on the fingers. The spectator cuts off a packet onto the left palm. Call this packet A.

Turn over packet A, bringing the face card of this packet into view. Whatever its value, add it to the value of the bottom card. If the face card of A is a nine, mentally add it to three, getting 12. Say, "Suppose I had 12 gallons of gas and I used nine gallons to get home. How much would I have left?"

The spectator answers three. Turn over the other packet, showing the three-spot at the face. Then put the deck aside, saying you don't want to burden the calculator with overuse.

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