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Notwithstanding today's notation of Roman numerals the numbers of 19, 49, 99 and 499 would have probably been notated as IXX, IL, IC and ID respectively during the Roman era which makes addition straightforward as follows:-

IXX+IL = IILXX (68)

IILXX+IC = CLXVII (167)

CLXVII+ID = DCLXVI (666)

When writing out Roman numerals use the least amount of numerals whenever possible

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