In base 11 vs In base 10
10 = 11
20 = 22
30 = 33
So, it is simply dividing whatever value in base 11 by 10 then multiplying it back by 11, but digit by digit.
Example, 45 in base 11:
45 = 40 + 5 (still true)
= 40/10*11 + 5 (leave the 5 untouched)
= 44 + 5
= 49 (in base 10)
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The alphabets stand for numbers in different bases. For example, 10 in base 12 would be A, 11 in base 12 would be B, and 12 in base 12 would be 10, and so on. 0D=D which is 13 in base 10, and 1D can be in many different bases.
0, 1, 2, 3, 10, 11, 12, 13, 20, 21.
10 ÷ 11 ÷ 12 = (10 ÷ 11) ÷ 12 = 5/66 = 0.07575... ≈ 0.076
The numbers are -12, -11, -10 and -9.
12/11 = 108/99 10/9 = 110/99 10/9 - 12/11 = 2/99 12/11 - 10/9 = -2/99