Missing the /s? Most people have a calculator in their pocket all the time now.

I remember having to split bar tabs by hand at the end of the night without a calculator. The waiter delivers a hand-written bill, and we'd calculate how much each person owed, splitting drinks individually and food equally, recalculating tax and tip to derive each person's total. We'd pool the cash in the middle of the table (with people taking their own change as they go where possible), then counting all the cash and making sure it still included sufficient tip. All after many pints. I do NOT miss those days.