It may have been thought to have been accurate at the time with the measuring equipment that was available then.
Actually, time changes things, it may have very well been a fact a 100 years ago.
That being said, it really wasn't the reason I posted it to begin with. It illustrates that the kids were actually taught to think and learn as compared to what they are taught today, which is not much.
After all, despots wouldn't be able to control people who would question them and their intentions or logic, would they?
My grandmother was a whiz at math, and could multiply huge numbers in her head. She was appalled that my teachers wouldn't allow it.
"How the heck do they expect your brain to grow?" she'd rant.
Inversely, they no longer teach kids to "sound out" words to learn spelling.
That test was indicative of a much more complete education than what's offered now, or when I went to school.