Either way is correct - however IMM should be written MIM. Working from the right-hand side - if the next letter to the left is lower - you subtract it.
Improved Answer:-
In accordance to the rules governing the Roman numeral system 1999 in Roman numerals is generally reckoned to be MCMXCIX. But these rules were made during the Middle Ages and centuries after when the Romans were no longer around for reference purposes.
Notwithstanding the above there's strong evidence to support the fact that the Romans themselves would have actually calculated 1999 on an abacus counting device as MDCCCCLXXXXVIIII and then by placing I to both sides of these numerals probably simplified them to IMM (-1+2000=1999)
It's interesting to note that when MCMXCIX is set out in the format of M+CM+XC+IX they total up to IMM because the Romans could have possibly added them up in the following manner:-
M+CM = CMM
CMM+XC = XMM
XMM+IX = IMM
Hindu-Arabic conversion:-
1000+900 = 1900
1900+90 = 1990
1990+9 = 1999
Roman numerals: M=1000, D=500, C=100, L=50, X=10, V=5 and I=1
The number 1999 in Roman numerals is MCMXCIX
MCMXCIX
it would be november,MCMXCIX
The Roman numerals for 07-01-1999 are VII-I-MCMXCIX.
15th November, 1999 is XV. XI. MCMXCIX in Roman numerals.
The number 1999 in Roman numerals is MCMXCIX
MCMXCIX
it would be november,MCMXCIX
The Roman numerals for 07-01-1999 are VII-I-MCMXCIX.
15th November, 1999 is XV. XI. MCMXCIX in Roman numerals.
1999 = mcmxcix mcmxcix; m = 1000, cm = 900, xc = 90, ix = 9
MIM is an incorrect way of writing 1999 in roman numerals. 1999 should be written MCMXCIX.
XIX-V-MCMXCIX
III-V-MCMXCIX
MCMXCIX EDIT: A shorter way to write it is MIM
November is 11 so XI-XX-MCMXCIX
In today's notation of Roman numerals: XII-XXVIII-MCMXCIX But during Tthe Roman era the eqivalent of 1999 was probably written out simply as IMM (2000-1)