Enjoy
which I found through StudyGeek (web, twitter, facebook, and a really cool tumblr feed of math-related images) UPDATE : or was it @PlusMathsOrg ? Or @MAAnow ?
We LOVE this factorisation dance on our sister site @nrichmaths http://t.co/Kd27utgNr9
— Plus Magazine (@plusmathsorg) March 24, 2014