After making a prediction on a piece of paper, the mentalist either borrows or introduces a calculator to be used in an experiment. After 'blindfolding' the display area of the calculator, spectators are asked to program in random numbers. When they are satisfied that they have made enough calculations, a spectator is asked to press the equal sign and read aloud the total printed in the display area. The numbers match your prediction. Why is this a miracle? First, you could use a borrowed calculator, but we have included a calculator. Secondly, the spectators can perform any number of calculations and thirdly, the spectators can perform any type of calculations. Even if you do no mentalism in your act, you will enjoy performing this fantastic effect.