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The ancient Romans would have worked out the equivalent of 1999 on an abacus counting board as MDCCCCLXXXXVIIII and then abridged it to IMM (2000-1) in written format which answers your question.

However, the equivalent of todays 1999 inRoman numerals when expressed as M+CM+XC+IX then they too become abridged to IMM as follows:-

M+CM = CMM

CMM+XC = XMM

XMM+IX = IMM

QED by David Gambell

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12y ago

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