So, once you see the site, you wonder "How the heck can this stupid thing read my mind?"
Well, of course, it can't really do that.Here's what it really does.
Take any two digit number up to 99, Let's say you pick 99.
Add the digits.
Subtract that number from the original number, then look at the corresponding symbol on the screen.
9+9=18. 99-18=81.
Therefore, it seems that the symbol by 81 is going to appear when you click the button.
