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Today we would convert the above numbers into Roman numerals as IX, XCIX, CMXCIX and MCMXCIX respectively which makes any form of mathematical operations with them almost impossible.

But during the Roman era the equivalent of 9 99 999 and 1999 were probably wrote out in a simplified format of IX, IC, IM and IMM respectively which makes addition straightforward as follows:-

IX+IC = CVIII (9+99 = 108)

CVIII+IM = MCVII (108+999 = 1,107)

MCVII+IMM = MMMCVI (1,107+1,999 = 3,106)

So when added together the answer is: MMMCVI which is the equivalent of 3,106

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