Mrs WBill teaches a class for teachers. One of the things that her students need to do is track their in-class hours. I double check their math for my wife, because a) she hates math and 2) I can add long strings of numbers in my head, quickly. 'Tis one of the bennies of being an engineer.
Anyhoo, I'd guess that 6 out of 10 of her students get the addition wrong. And, we're not talking differential calculus, here, we're talking 1+3+2+1+4+1+1....and so on.
I'd also guess that 1 in 4 can't tell time. They'll count an 8:00 to noon shift as 5 hours. I know how it happens (count on your fingers 8,9,10,11,12) but I never cease to be amazed.
These are the teachers people leave their kids with at day care. It's also why Mrs WBill and I agreed that she'd stay home with the kids and only teach a class or two for fun.
Well, I thought that I had posted enough on this thread until reading your post, just above.
There is an old saying that, “In the land of the blind, the one-eyed man is king.”
Those incompetent teachers, of whom you write, have helped produce at least two generations filled with nearly “blind” citizens. And the state and national capitols are full of one-eyed “representatives.”