Because they always work problems out with a pencil.
A grafight.
Because it was a Number 2.
Because they knead dough.
Someone who works in a mint.
If you open the windows in a submarine, your problems will begin.
They both have problems finding x.
They get a pencil and work it out.
Farhfrumpoopin'.
Math teachers, because every student counts.
Gee I'm a tree!