Now start to try the numbers between 89 and 80.
Wow! They all come out to 72!
Well, well, well, no matter what number you pick, it will come out to a multiple of 9!
Example below:

And check this out! All of the multiples of 9 have the same symbol!
And also this: The symbols for the multiples of 9 change every time too, so it gives the appearance of reading your mind!