calculator
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HTML Calculator

Solution is

To use this calculator you will have to input a 0 then enter the number like 555 and then hit = to give you the sum 365.

Now if you did get the sum 365 then you know how to use this.What is the ture number of 555 or if you like you can type any number just do not forget to put 0 then your number then= to get the true number.

 

 

Say I wanted to find the ture number of 216 I would type 0216=264 so the true number of 216 is 264

 

You can find the true number of any number with this just when you type 0216 it will say 0410=264