Long division? On paper, using your brain? No one does that anymore. Imagine using a slide rule.
Yes it was using paper and a brain. Slide rules were not used in my grade school education. I could see how things have gone downhill.
When I was teaching a bit I would take a slide rule into the algebra class and tell then it was a calculator. For Algebra I I showed them how to do multiplication and division. For the Algebra II/trig class they got to see the trig and log scales used and for the pre-calc class they got to see use of the exponential scales. All were amazed at the ingenuity of it!
In Texas, in the 60’s and 70’s and 80’s, they ran regulat competitions in number sense (strictly mental arithmetic and math (word problems), slide rule, and science.
I competed in slide rule (junior and senior) and science (senior) in high school. Won many times, but placed only in science at the state level.
Slide rule? Heck, I got you one better than that - use an abacus!
I had to find a refresher course on Youtube to help my son with his homework. I hadn't done long division with a pencil and paper in at least 35 years.
It came back pretty quickly.
Though calculators were coming into being....my college math professor only allowed slide rulers. Best math teacher I ever had.
I actually learned how to use a slide rule in the ‘60s when dad was taking classes to become and Electrical Engineer....as he used me as his Guinea pig to help learn it better himself, it actually helped me when I got into Algebra and Trig