A handheld calculator and a slide rule. If the power goes out for a long time, I'll still be doing math while the rest of you chumps will be using your fingers to count to 10.
Yes, learned how with a program on a VAX computer ('80s) using a VT100 terminal. I managed to get through high school and college by hunt and peck, though. Definitely not recommended.
I believe I speak for most Americans: Fuck you and your tariffs, you fucking fuck!