When you're ready, write
the digit on the right of
your result in the
box :

Then, click on      

  Great !Great ! You got                      

                                                   

   

 

One number shown can reveal everything

 

Choose a three-digit number.
Make sure the first digit is not
the same as the third digit.
Now write it from right to left. 
Calculate lthe difference between
the two numbers you got
(The bigger one minus the smaller one...)

Click herefor an example.

Very easy !

    

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