eeerm. I appreciate that there are a limited number of numbers that you can get by "picking a 2 digit number, adding the digits together, and then subtracting that from the origional number" and that of the numbers possible the symbols are repeated. But there are over 5 different symbols that I could get, so how does this work? It showed the correct symbol 8 times in a row bforeit got it wrong. Chance?
Now I feel stupid ðŸ˜³

Your not stupid, that is just a simple parlor trick. Take 99 for example. Add the two 9s and you get 18. Subtract from 99 and you get 81. Try it with 98. Same result. Same result for everything that is 90 and above (2 digit). So the required symbol should be at 81 for any number chosen in the 90s. Same theory for each other decade. If the "guess" was wrong, the page author was in error (or your math).

yeah, you're right. I got the trick of it almost, but missed that the symbols that you could get changed each time that you did it. You could only get 1 symbol each time, and that's the one it shows you... Must have been having a bad brain day.