“Why did the amoeba flunk the math test?”/“Because it multiplied by dividing.”

A math riddle is:
   
Q: Why did the amoeba flunk the math test?
A: Because it multiplied by dividing.
 
The joke has been cited in print since at least 2006.
 
   
Google Books
777 Great Clean Jokes
By Jennifer Hahn
Uhrichsville, OH: Barbour Publishing, Inc.
2006
Pg. ?:
316
Why did the amoeba flunk the math test?
Because it multiplied by dividing.
 
Twitter
jokes central
@jokescentral
#joke Q. Why did the amoebae flunk the math test?
A. Because it multiplied by dividing!
12:57 AM - 6 Oct 2009
 
Twitter
Srini Metta
@MLMLeadsMastery
Why Did Amoeba Flunk The Math Test? Because it Multiplied by dividing 😊
6:16 PM - 8 Jan 2010
 
Twitter
Giggle-Bug
@GetTheGiggleBug
Why did the amoeba flunk his maths test? Because it multiplied by dividing. http://www.giggle-bug.co.uk http://bit.ly/bNfTfK
12:13 PM - 19 Feb 2010
     
27 October 2010, Evening News (Edinburgh, Scotland), “Joke of the day,” pg. 17:
Why did the amoeba fail the arithmetic test?
Because it multiplied by dividing!
Mark Wilson, Portobello
 
Twitter 
AlphaMeticApp
@AlphaMeticApp
Q: Why did the #amoeba #flunk the #math test?
A: Because it #multiplied by #dividing
#MathJokes #LetsGetWordy http://goo.gl/oX6j6w
11:11 AM - 17 Aug 2014
     
Reddit—Jokes 
Posted by u/LetsGrin October 1, 2014
Why did the amoeba flunk the math test?
Because it multiplied by dividing.
 
25 July 2016, Fraser Coast Chronicle (Maryborough, Queensland), pg. 12:
Q. Why did the amoebae flunk the math test?
A. Because it multiplied by dividing!
 
Reddit—Jokes
Posted by u/halfhippo999 May 20, 2019
Why did the amoeba fail math class?
Because it multiplied by dividing