Here’s my story from last weekend at a football game concession stand at my college alma mater. The order for three sandwiches and three coffees for my wife, my son and me came to an even $31. I handed the kid two twenties and a single - $41. He handed me back the single and wanted to give me a bunch of ones. I told him the change was just $10, give me two fives or a ten. He almost vapor-locked but recovered to get the change right.
Here’s the kicker: the stand was being run by the local high school band as a fund-raiser so the kid is no dummy. As I pointed out to my son, a band member through high school and college, the kid could be told that he was going to march 8 steps per 5 yards at 135 beats per minute and the music being played was in 6/8 time and he wouldn’t have a problem with doing any of that but math in his head just stumped him. It’s for the reason your illustration shows.
"Yeah, so I went to the Vet for the game last Sunday. I bought a hundred Dollars of beer there, AND I DIDN'T EVEN GET A BUZZ!!!"