The calculator function of the app works fine, and the math is correct UNTIL you multiply a three digit number by a three digit number and divide by 4 (the way you choose a page number). When you do this, the calculator just gives you a random number, and not the actual number that a calculator would give. For example, I did the trick, and the spectator did 100 x 100 / 1000... This should equal 10, but the calculator said 26.7... HORRIBLE!!! THE SPECTATORS REALIZE THE TRICK IS FAKE!!! I want my money back, and expect an fix in the future to make the calculator work like a CALCULATOR.