MCMLX breaks the same rule you just invented.
it seems that each magnitude must be handled individually, so you write 999 as "CMXCIX" and not as "IM"
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Roman numerals were a lot easier when the Romans wrote them - there was none of this subtracting nonsense. 1960 is MDCCCCLX. The subtraction form was invented by a clock manufacturer who thought IIII was hard to read, and VIIII took up too much space. It was never meant to be extended beyond that.
That makes a lot of sense. Trying to do arithmetic using Roman numbers are they currently are is tricky.
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....and yet, NOBODY has said HTF they multiplied numbers.
This guy does it in binary!
if you analise the stpes, you can see that they are the same as doing long multiplication in base 2
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