Curious why the currency would matter, unless people pay in different currencies. The same math applies regardless of currency.
For example if I go to a restaurant with a large group and each item on the bill is in yen, we need to sum each person's total in yen and then convert each of their totals into GBP so we can each transfer what we owe (easy enough)
But depending on the exchange rates and rounding, those calculations can sometimes be off by a penny or two. Some people don't mind, others do
Personally I have never participated in a meal that ended with everyone going over the receipt and paying for exactly what they ate down to a few cents. I would consider that miserly, ruining the experience. Why go out at all if you have to carefully monitor every nickel and dime, and worry that someone might cheat you out of a few coins?