The concepts of adding machines and calculators were also slowly phased in over the span of a century. The first commercially successfully adding machines hit the market in the 1890's, and pocket calculators took off in the 1980's. AI went from theory to answering hand written math homework questions from a photograph in a few years.
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I only had a calculator (at a technical university) starting in the mid-1970s. Prices were dropping like a stone in about that period. In high school it was pretty much slide rules.