zlacker

The computation of early (primary school) math courses could be done with a counting board, which is a type of general-purpose computer with memory consisting of buttons/coins and a human for a CPU.

Later (high school / undergraduate coursework), it would be good to use a programming language like Python or Julia or Swift ....

I also think students should spend at least a few weeks or months using a slide rule and printed tables for basic arithmetic, but more to learn about logarithms and mathematical history than to learn about computational mathematics per se.