What’s the king of the pencil case? The rules.
What did the zero say to the eight? Nice belt!
What’s the difference between a diameter and a radius? A Radius.
How does a mathematician call his dog? Cauchy, because it leaves a residue at every pole.
What’s purple and commutes? An Abelian grape.
What’s yellow and imaginary? A square-root of negative banana.
How do you know that your dentist studied algebra? She said all the candy gave me exponential decay.