Are kids today not taught how to count change back?

I was at a store and my bill came to 23.84. The girl, probably in her early 20’s just kept standing there with a funny look on her face. I asked her what was wrong. She said “the machine didn’t tell me how much change to give back.” She absolutely had no idea how to count it back to me. I told her to give me a penny, a nickel, a dime and a dollar. Then showed her how to count it back. She had no interest in learning, but seemed like a nice girl.
Those of you with kids, or who are young, in your twenties, do you know how to count back change?