"He wears glasses during math because it improves…

A popular math pun on the word “division” is:

“He wears glasses during math because it improves division.”

The joke has been cited in print since at least 2001.

Google Groups: alt.humor.puns
Puns of the Weak 9/7/01
Stan Kegel
9/7/01
(...)
He wears glasses during math because it improves divison. (Pun of the Day)

Google Groups: alt.humor.puns
Puns of the Weak Special: 100 Top One-Liners
Stan Kegel
5/25/03
(...)
15. He wears glasses during math because it improves divison.

Google Books
The Indispensable Guide to Clean Humor and Wit
By Mit Sorrels and Kevin Sorrels
Xlibris Corporation (Xlibris.com)
2009
Pg. ?:
He wears glasses during math because it improves division.

Twitter
Bethany
‏@bighoneybliss
Oh! It’s #punday He wears glasses during math because it improves divison.
1:33 PM - 22 Mar 2009

Twitter
Elizabeth Sedlock
‏@EPSedlock
@pogue “He wears glasses during math because it improves division.”
8:42 PM - 1 Apr 2009

Google Books
150 Totally Fresh Fully Mint School Jokes Bru!:
Turn that learning frown upside down
By Matthew Grant
Published by author
2014
Pg. ?:
Question: Why did the girl wear glasses during math class?
Answer: Because it improves di-vison!

“He wears glasses during math because it improves division”