A math riddle is:

*Q: What’s a math teacher’s favorite drink?
A: Root beer.*

The joke has been cited in print since at least 2016.

“If you put root beer in a square cup, does it become beer?” is another math and root beer joke.

Andrew Wall

@Awall1894

What’s a math majors favorite drink? Root beer in a square glass 😂😂😂😂😂 #MathJokesForDays

10:27 AM - 9 Sep 2014

The Busted Knuckle Chronicles

Friday, 26 February 2016 00:00

*Short chuckles*

(...)

Q: What’s a math teacher’s favorite drink?

A: Root Beer

notbannedbysoda

@n0tbannedbysoda

@Idubbbz @NFKRZAlt @HillaryClinton @realDonaldTrump @AmericanCancer What’s a math teacher’s favorite drink? ROOT BEER

7:38 PM - 25 Jul 2016

Reddit—Jokes

whats a math teachers favorite soda

submitted May 15, 2017 by Nanopois0n

root beer