Er...

PRINT "Choose any two digit number, add together both digits"

Let's say my number is 42. I add together both digits to get 6.

Subtract the total from your original number



PRINT "and then subtract the total from your original number"

42 - 6 = 36
PRINT "When you have the final number look it up on the chart"

I look up 36 in the chart and the symbol next to it is ��. I press Enter and the program does indeed say ��. Of course, you guessed the trick. The formatting in the chart may have been messed up because the forum trims spaces, but oh well.