Doubtful, but if anything mine would be more accurate. Fewer calculation steps to lose precision on. I think most spreadsheet software fudges floating point precision anyway. A computer programmer may accept that 0.1+0.2 is not 0.3 but an accountant or mathematician would not be having it.

I think she was just shit at maths tbh. As a kid you sort of assume all the teachers know more than you about every subject, and that’s not the case at all.