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

    drakonsis

    5 + 4 = 10 (9) correct
    7 + 8 = 16 (15) correct
    25 + 36 = 67 (61) wrong
    42 - 5 = 41 (37) wrong
    7 x 4 = 31 (28) correct
    8 x 12 = 116 (96) wrong

    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

    JakeBob

    For crying out loud....

    If you guys want the whole "Is Cirno Right?" argument again, lemme save you the time and point you towards the parent post.

    Oh, and alto, 12 in base 9 is 13.

    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.