Mathematician jokes
What does the B in Benoît B. Mandelbrot stand for?
Benoît B. Mandelbrot.
Why don't Romans find algebra interesting?
X is always 10.
The fattest knight at King Arthur's round table was Sir Cumeference. He acquired his size from too much pi.
Who invented fractions?
Henry the 1/8.
I lent a hot girl my umbrella yesterday. That takes the number of girls I've made wet this year to -1.