The spectator must use a calculator in all versions. Wunderkind uses an app that is hidden with a calculator on the magician's phone. The calculator does the math for the magician making the routine extremely easy to do. You can perform this without the Wunderkind app. This has been the approach that has been used by many for many, many years.
Answered at 08:19pm on May 12th, 2019 by joshburch (234 karma)
Andreas explain briefly how to perform the effect without a calculator. But that is much more difficult to perform than the Wunderkind method. The whole point of Wunderkind is to make it easy for you.
Answered at 11:27pm on May 11th, 2019 by jhoffma (0 karma)