Many decades ago I taught a general math course in a public school. I taught things like estimation and percentages. And also doing basic calculations in your head.
Those skills are all gone now, replaced by a calculator. (Not my choice.)
The kids are much worse for it.
The ability to mentally determine reasonableness is a under appreciated skill.
Many decades ago I taught a general math course in a public school. I taught things like estimation and percentages. And also doing basic calculations in your head.
I wish I was like this guy.
“Did you know I built a bridge once?”
https://www.youtube.com/watch?v=m8Mc-38C88g