Four small rods, each with a variety of numbers printed onto it, are given to a spectator to thoroughly examine. The spectator is requested to randomly place them in a row. This done, the magician instantly writes down a total figure. The numbers showing on the rods are added together, when the total is arrived at, the magician's instant calculation is seen to be correct. The trick is now repeated - this time though, the magician makes a prediction, the prediction is of the total of the figures on the underside of the rods, the side no one has seen. The rods are turned over and added together, again the magician's total is correct.
Very ease to do, does not require mathematical skills and can be done anywhere & anytime.