boy in a dark room

    • Meme:
      9 + 10 = 21

    • Added:

      Dec 13, 2014 at 02:26PM EST


      Adam DeLand.

    • Updated:

      May 03, 2021 at 07:05AM EDT




    9+10=21 is an incorrect answer to a math problem, which was first spoken online in a Vine video. The video, also known as “What’s Nine Plus Ten,” quickly became a fad within the Vine community, leading to remixes and other parody, and later spreading to various other internet communities. In Summer 2019, the video saw a resurgence in popularity on Instagram, Twitter and iFunny.