To perform calculations in a dream is a sign of great concern for economic issues. When the final result is positive and you do not feel overwhelmed by the effort, it reflects your mastery of the situation. Otherwise, it will be a warning to be more cautious.
[1]Pay attention to the symbolic meaning of numbers! Do you want to—or should you—take stock of your life and pay for your deeds, meaning taking responsibility? See Price / Payment.
Folklore: A good omen when you can pay your bills, bad if you cannot.
[2]1. Planning something carefully and intentional;
2. Logical method; Prov. 3:5-6.
[3]