[dhs12345]

Counting back change is pretty easy, once you have done it a couple of times.

These kids have never been taught because the register does it for them.

A little practice and they will figure it out. They just need to be taught.

BTW,

2 pennies + 1 nickle + 2 quarters + 2 dollars is your change.

[Little Ray]

When I buy stuff, I do the change in my head to keep my arithmetic faculties from decaying...

[antiRepublicrat]

Counting back change is pretty easy, once you have done it a couple of times.

Back in grade school I learned it by counting up. Purchase is $2.43 given $10, start counting (pennies) 2.44, 2.45, (nickel) 2.50, (quarter) 2.75, 3.00, (dollar) 4, 5, (5 dollar) 10. It also makes sure you use the least number of coins or bills.

You can tell the older, more experienced cashiers because you can see them doing this mentally even though the register told them how much to give back.