Well, in the octal system (base 8), nine is 118 so 118 - 18 = 108 (which is eight).
Sometimes, if it is known that you are working in a base, then the subscript is left off.
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The Roman numeral for nine is IX. X is 10 and I is 1. When the I is before the X you subtract.
Subtract negative 3.
11
5/10 - 4/10 = 1/10
5