Ask someone to explain fractions, convert to decimal, or add two times together and get the total minutes and seconds.

It's not the fault of a computer or a tool, it's just that some people are getting paid minimum wage to slap down burgers (or serve them from a window) because they don't have an education.

If someone can't add and subtract in base 10, what do they do with something that actually takes a bit of brain power?

Blame the dummying down of our education system. Not the teachers, the system!