Here's a collection of some of the math jokes I found online.
Two random variables were talking in a bar. They thought they were discrete but I heard their chatter continuously.
What does a mathematician use to measure the weight of trees? A Log Scale.
How do you tell one bathroom full of statisticians from another? Check the p-value.
A bicycle can't stand alone because it is two-tired.
Why can't you trust atoms? Those guys make up everything.
Where does bad light end up? In a prism.
What do you call 8 Hobbits? A Hobbyte.
There are 10 types of people in the world: Those who understand ternary, those who don't, and those who thought this was a binary joke.