fwiw, I learned to compute square roots in school in the 80s (I think it was the estimation method, which I was extremely bad at).

Calculators of any kind were forbidden at school, which sucked, if you had one of those cool Casio watch calculators. Shorts were also forbidden, because suffering is good for you, apparently.

I've never had to do it since, of course. Though I do now wear shorts on occasion.