Yes Sensei, Cirno is a genius.

Holy shit. It works.

Higher res on artist's pixiv.

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

Huh? Am I missing some mathematical pun here?

http://www.cleavebooks.co.uk/scol/calnumba.htm

This is very clever.

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

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

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

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

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.

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

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.