Because they always work problems out with a pencil.
Works it out with a pencil.
Pencil-vania.
Wooden you like to know
I always loved this one: (works better said out loud of course) What do you call a fish with no eyes... A FSHHH
Dilemmanade
It has so many problems! -Sorry doing a whole bunch of math today and i thought of this.
Farhfrumpoopin'.
Google Fiber Note: Randomly came up with this joke today
Calc-U-LATER
He works them out with a pencil.