I take it that he helps with the checkbook? I always put the right amount to the left and then when I deduct it I change it to the next dollar but I also like the idea of $1 higher every time. That is a fast way to make some moulah! but the reason I round is more for the 00's. I hate trying to subtract and usually need but never have a calculator. If I do it in my head I might make a mistake that could be really costly. Promote it to him that this is a way to have a little extra when you are running short and he wants his wings! My husband also adores hot wings and the hotter the better. yet, he won't eat chicken!
Explain to him that you have tried showing him the exact amount and he still spends so you are trying to keep from paying huge overdraft fees.