An envelope containing a prediction is introduced, along with seven cards, each displaying a different number. You explain that there is something written behind each card, but that will be revealed later.

The cards are then arranged in two rows - one with four cards and the other with three. The participant is asked to eliminate one of the rows, and you turn over the cards in that row, revealing that you had predicted which row they would choose.

Next, the participant pairs one card from the remaining row with any other card in the same row. The numbers on the selected cards are added together, and the sum matches the prediction inside the envelope.