I was always terrible at math. K thru 2 i was at one school where we worked on addition, subtraction, multiplication, division. Then we moved to a school where the kids were doing fractions. I had a real problem paying attention to things that were boring so i was always behind. It took me 4 years of high school to finish 2 years of math. I didn't really understand fractions until i started buying/smoking marijuana.

But...

I could count money when i was 5. You basically just need to be able to count from 0-100 and you have completely mastered the art of change giving. If i can do it anyone can.