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Spectators +, -, x or ÷ several random multi digit numbers on a calculator.
When they press = the answer matches your prediction!
No Gimmicks! Easy to do!
A calculator is passed around the audience. Several spectators enter a random multi digit number. Each of them adds, subtracts, multiplies or divides the previous number to their own random number. As many or as few entries are made as desired. When the last volunteer hits equals. The answer matches the prediction you made in advance!
Use with iPhone and most scientific calculators. No gimmicks of any kind are used at all!
Printed routine and explanation are all that are included.
Tom London performed this effect on Season 12 of America's Got Talent