The Roman numeral MCMXCIX corresponds to the Arabic number 1999.
MCMXCIX = 1999
Symbols are written and read from left to right, from highest to lowest.
If number MCMXCIX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1999.
MCMXCVIII is number 1998
MM is number 2000
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