They use a cow-culator! Ba-dum-tsss!
You use a cow-culator. Or you round them up. Or any other method the commenters want.
A cow-culator.
With a cow-culator! (Rimshot)
A cow-culator! (Cue groans)
A *cow*culater. I made it up myself, so don't groan at the pun.
Sir. Groan worthy penguin jokes(https://allwrong.wordpress.com/2007/10/05/penguin-riddles/)
Swigonometry.
Homophonic I'm sorry...
They take things literally.
A BoVine
They herd it through the bovine.
Math problems actually exist
A math problem.
Cause it doesn't want to be latte. Sorry. I just came up with this lame joke. Downvotes ahoy!
They didn't want to leave their brothers behind.
Pair-a-dice!
Petroleum
Because he always gives sound advice. Ba dum tsss.