sleepie, is it just distraction or are you having trouble making change? You know the pre-electronic method of making change? Most don't these days.
You make a $5.67 sale. They hand you a $10
Count up from 5.67 to 10 pulling change from the drawer into your hand.
Start with pennies. 68...69...70
A nickel makes it $0.75
A quarter makes $6
Now pull $1's. 7...8...9...10.
Change of $5.67 from $10
No math, no calculator. I still don't know the amount of change.
Hope that helps.