Watch This When You're High - How Do Calculators Work?

Somebody in the comments section dropped this one and I can't find it anymore to shout them out. They must have deleted it themselves after second-guessing it because there's no way the algorithm or editors would delete it. 

But anyway, it's a great question. When you really think about it, how the fuck do calculators work?

Keep the suggestions coming. Keep them classy. No butt stuff.