The mentalist shows a prediction in an envelope or on a board and sets it aside. He or she then passes out the notebook and requests that different spectators write down a three of four digit number on the page, directly under each number in a column (see photo), etc. The forth and final spectator is asked to total the columns up. When this person announces the total of the columns, the performer then has his prediction revealed - and it matches the total called out by the final spectator! Includes instructions. Very good condition.