If Bash math is ugly, Python might be more palatable. You don't need to preface your calculations with $((, after all. Using Python is much simpler. Just type "python" at the Linux prompt.

Mathics doesn’t work in my laptop’s browser (latest Firefox Quantum 66.05 64-bit), the site loads but I get two rotating wait worms as if something is trying to load.

Many programming languages include libraries to do more complicated math. You can do statistics, numerical analysis or handle big numbers. One topic many programming languages have difficulty with is ...