jeeze Jim,
I thought you had to go to the payday lender so's you could get a tire fixed on the mower.
I still use, and balance, a checkbook without a calculator at times, so I'm still a bit practiced up on "borrowing" from the next number over.
It took the expertise of a future nuclear engineer to get me through math when I was growing up.
No simple "good at math" person would suffice.