Danbooru

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(9) 4girls blonde_hair blue_hair bow chalkboard cirno comic daiyousei dress green_hair hair_bow hand_up hat highres kamishirasawa_keine maiku math multiple_girls nonary o_o ribbon rumia solid_circle_eyes touhou translated wings
(9) 4girls cirno comic daiyousei kamishirasawa_keine maiku math multiple_girls nonary rumia touhou translated
cirno, daiyousei, kamishirasawa keine, and rumia (touhou) drawn by maiku
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    CGrascal

    Yes Sensei, Cirno is a genius.

    sgcdonmai

    Holy shit. It works.

    darth tohru

    Higher res on artist's pixiv.

    saiyoucho

    I never doubted you Cirno! ;__; You rule!

    user 9851

    Huh? Am I missing some mathematical pun here?

    imaliar

    This is very clever.

    jimreynold2nd

    lol! now that's what I call a genius - do math in base 9 to avoid the number ⑨ :D

    alto555

    25(9) + 36(9) = 62 (9) so CORRECT

    alto555

    42(9) - 5(9) = 36 (9) so CORRECT again
    8(9) * 12 (9) = 8 * 11 = 88 = 107(9) so CORRRREEEECT!

    input was taken as base 9 too

    alto555

    @Jake Bob. 12 = 13(9) BUT 12(9) = 11. And she had taken all inputs in (9)

    JakeBob

    alto555 said:
    @Jake Bob. 12 = 13(9) BUT 12(9) = 11. And she had taken all inputs in (9)

    (it's fine to quote btw)

    And yes, you're right, I counted the wrong way. How silly of me.

    But still, check the parent post.