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Notwithstanding today's notation of Roman numerals inasmuch that during the Roman era itself the equivalent of the above numbers were probably written out as IXX, IL, IC, ID and MCX respectively which makes addition quite straightforward as follows:-

IXX+IL = LXVIII (19+49 = 68)

LXVIII+IC = CLXVII (68+99 = 167)

CLXVII+ID = DCLXVI (167+499 = 666)

DCLXVI+MCX = MDCCLXXVI (666+1110 = 1776)

Today's rules governing the Roman numeral system were introduced during the Middle Ages presumably to make it easier to convert Roman numerals into Hindu-Arabic numerals and vice versa.

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