The performer displays four plaques, each with numerals on each side in random order. The performer also clearly demonstrates that with the simple displacement of just one of the plaques, the number formed could be changed dramatically, even by thousands. For example, 1239 could very well have been 9123, a difference of almost 8000. The spectator is then invited to place the plaques in any order he wishes on to a small stand and to add up all of the five resulting four-digit numbers. The performer, without viewing the numbers which have been added, knows the total long before the spectator has commenced his addition!