I guess my first port was too ambiguous. The only mathematical combinations for a 2 digit number minus the sum of the digits are as follows : 81,72,63,54,45,36,27,18,9 and 0 if you didn't listen to the instructions saying to use a 2 digit number. ex. 8-8=0 otherwise 56 - (5+6) or 11 = 45. etc. The symbols in any given turn will be the same for every number I have listed. the symbol changes for all numbers each time you click the glass. If it doesn't work for you it is time to go back to school and learn arithmatic.
