I used to use a TI-83+, but now I&#x27;ve gotten into the habit of opening a Python or Node.js REPL for math. That way, I can copy-paste values to and from emails or chat. It also helps that I already know the syntax and math libs.<p>I tried bc[1] as well, but it has some really annoying defaults. For example: While it&#x27;s capable of arbitrary precision, it calculates out to zero decimal places unless you tell it otherwise.<p>1. <a href="https:&#x2F;&#x2F;www.gnu.org&#x2F;software&#x2F;bc&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.gnu.org&#x2F;software&#x2F;bc&#x2F;</a>