Bubba, just pick a 2-digit number.
Example: 25
Add the 2 and 5 and you have 7.
Then subtract the 7 from the 25.
The answer is 18
Now look for the number 18 on the chart to the right.
Look at the symbol that's shown with the number 18.
Then click on the "magic?" ball
Surprise. It shows you the symbol you were looking at.
Show it to Patzy. She'll be surprised, too.