[taejo]

As a kid who chronically forgot to bring her calculator to school for about 12 years straight, I can now do long division well enough that I sometimes do it rather than get up to fetch my phone from the other room. It's also how I do division in my head.

I did pursue mathematics academically but I don't know if it ever came up in university math; more so in physics and computer science.

EDIT: apparently what I do is "short division", which is just long division but you don't write down all the steps.