I've cobbled together a few. It's half interesting, and half boring.
The boring half is all carry-the-one manual operations that are very much like the addition, multi-digit multiplication, and long division that you learned at a classroom chalkboard.
The more interesting is things like modular exponentiation: there's a trick to computing n^e%p for large values, https://en.wikipedia.org/wiki/Modular_exponentiation goes into some detail. It's an operation used in both RSA and public curve cryptography.
I once emailed Grant from 3b1b and asked if he could explain convolution. Not neural-net convolution, but transfer convolution you learn in linear systems: e.g. f * g where you flip and slide g over f.
His short response: "That's too boring." I was a little miffed. Well, yeah, ECC is boring too, until someone like you makes cool graphics.
The boring half is all carry-the-one manual operations that are very much like the addition, multi-digit multiplication, and long division that you learned at a classroom chalkboard.
The more interesting is things like modular exponentiation: there's a trick to computing n^e%p for large values, https://en.wikipedia.org/wiki/Modular_exponentiation goes into some detail. It's an operation used in both RSA and public curve cryptography.