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This calculator takes the traditional add-a-number routine into the 21st century.

Imagine handing this calculator out to a member of the audience and asking him to enter a three digit number press the Multiply button and hand it to another person in the audience.  They are then asked to enter another three digit number, press the Multiply button and hand it on to a final person.  They enter another three digit number and then press the Equal button.  The performer can now slowly reveal the answer or the answer is read out and correctly matches the prediction you made earlier.

With this calculator you'll be able to add this powerful routine to your own show.


Measures 12cm x 7.5cm.


It runs off 1 button cell battery which is easily replaced. 

You receive the special calculator plus a manuscript which describes this powerful routine.

Forcing Calculator




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    © 2019 by Martin Duffy