My dumb little tip jar math actually hit $200 and I can't stop grinning
I keep a jar for the change left over from my lunch runs, and after counting it on the kitchen table last night it came to $203.75, which is way more than the $80 I guessed in my head. Turns out I was rounding every purchase up wrong for a year, like calling $7.40 eight bucks and then losing track. What's the dumbest math mistake that ended up working in your favor?