I think most cashiers would be lost today just trying to make change without their cash register figuring it out for them.
Trust me, they couldn’t do it then either. Nobody is taught how to count your change back to you anymore. Not like when I was growing up. That was one of my first lessons when I had my first paid job in HS.
No way they know how to make change
I was just in the supermarket and my bill came to $40.16. I gave the cashier a one hundred dollar bill and 16 cents. She had to call her supervisor over to help give me the change.