Urgh, so true for this troper. Which becomes a problem especially if you are going to use a lot of scientific elements and obssessed with details...

I consider myself a writer and my math grades are extremely low.

Averting this trope is the exact reason why this troper has a calculator by his writing station/a character biography for every character he has that works back to at least the birth year of the grandparents of the character in question.