I am really curious what skill are those calculators teaching. I grew up in a country where they were not used, and I went to a math-oriented high school, and m

I am really curious what skill are those calculators teaching. I grew up in a country where they were not used, and I went to a math-oriented high school, and math grad school. We had math problems designed for paper which taught us how to think. We had math problems where we had to use advanced numeric methods, because that's what most real life problems are like. Where is the need for something in between coming from?