ELI5: Explain Like I'm 5

Mathematical joke

Okay kiddo, have you heard of jokes? They are little stories that make us laugh.
Well, a mathematical joke is a joke that uses numbers and math to make us laugh.
For example, if a math teacher says, "Why did the math book look sad? Because it had too many problems."
See, it's funny because the word "problems" can mean both math problems and issues.
Mathematical jokes can be a lot of fun, especially if you like numbers and are good at math!