Roman numerals....
1 = I
2 = II
3 = III
4 = IV (or IIII on old clocks, watches and sundials)
5 = V
6 = VI
7 = VII
8 = VIII
9 = IX
10 = X
20 = XX
30 = XXX
40 = XL
50 = L
60 = LX
70 = LXX
80 = LXXX
90 = XC
100 = C
500 = D
1000 = M
The numbers 11 - 19 and 21 - 29 etc follow the same pattern as the numbers 1 to 9 but preceeded by X or XX etc. The same applies to numbers preceeded by 100s or 1000s. Some examples...
14 = XIV
44 = XLIV
88 = LXXXVIII
151 = CLI
423 = CDXXIII
666 = DCLXVI
1066 = MLXVI
2009 = MMIX
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1992, that is what it is in regular numbers.
That is already in roman numerals. As regular English numbers it is 2,044 though.
I would convert them back into Hindu-Arabic numerals, do the addition and then convert the answer to Roman numerals.
It is: 27 = XXVII when converted into Roman numerals
In today's terms 07.09.1983 converted into Roman numerals is VII-IX-MCMLXXXIII though the Romans themselves probably wrote out these numbers different to what we do today.