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The way we write out Roman numerals today differs in many respects to how the ancient Romans actually did themselves inasmuch that today we would convert 1488 and 1999 into Roman numerals as MCDLXXXVIII and MCMXCIX respectively thus inhibiting any mathematical interaction between them.

But there is evidence to suggest that the Romans would have probably subtracted the equivalent of the given numbers in either of the following formats:-

IMM-IIXMD = DXI => (2000-1)-(1500-12) = 511

Alternatively by cancelling out the numerals:-

MDCCCCLXXXXVIIII-MCCCCLXXXVIII = DXI => 1999-1488 = 511

Note: 5*I=V, 2*V=X, 5*X=L, 2*L=C, 5*C=D and 2*D=M

Values: M=1000, D=500, C=100, L=50, X=10, V=5 and I=1

QED by David Gambell

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