I guess this girl would be really be sucking if she had to count out change like I did when I worked at a store in high school.
The latest model cash registers have a display. Not only will they tell you what the change is but they will give you a picture - so many $5 bills, so many quarters, so many nickles, dimes, and pennies. Ny 15 year old daughter can blow me out of the water where Algebra and Calculus and Geometry are concerned but basic math? Multiplying or dividing large numbers? Without a calculator I can beat her easily.