Six cards are placed face down on the table in a row. The magician then designates the cards by numbering them from one end to the other 1, 2, 3, 4, 5, and 6. A die is handed to the spectator, who looks it over carefully. The die is rolled, and whatever number comes up is the card that will be used. Let's say the number is 3.

The rest of the cards are gathered up and put in the magician's pocket. The spectator is asked to roll the die and remember the outcome. He is then to look at the bottom number of the die and add the two numbers, so the total is 7. The spectator is told to divide the total by 2. 3 1/2 is the answer. The magician pretends to be stumped and something has gone terribly wrong. The spectator is asked to turn the card over anyway, and lo and behold, the selected card is the 3 1/2 of clubs!