MCMXCIX
MIM (Should work as well, and easier to write)
Improved Answer:-
In accordance with the rules governing the Roman numeral system made during the Middle Ages and centuries after the Romans had left England 1999 in Roman numerals is considered to be MCMXCIX.
But there is strong evidence to support the fact that the Romans themselves would have probably calculated 1999 on an abacus counting device as MDCCCCLXXXXVIIII and by placing I to both sides of these numerals would have simplified them to IMM (-1+2000 = 1999) in written form.
04/02/1999
15th November, 1999 is XV. XI. MCMXCIX in Roman numerals.
MCMXCIX
MCMXCIX EDIT: A shorter way to write it is MIM
The number 1999 in Roman numerals is MCMXCIX
You write 1533 in roman numerals like this: MDXXXIII
15th November, 1999 is XV. XI. MCMXCIX in Roman numerals.
MCMXCIX
MCMXCIX EDIT: A shorter way to write it is MIM
The number 1999 in Roman numerals is MCMXCIX
You write 1533 in roman numerals like this: MDXXXIII
Expressed in Roman numerals, 1999 - 1910 is equal to LXXXIX.
To write twenty in Roman numerals, you simply write the letter X.
To write 19000 in Roman numerals, combine the Roman numerals for 1000 (M) and 9000 (IX). Therefore, 19000 in Roman numerals is written as MXCM.
CCCLX is the number 280 in roman numerals. This number is used to represent what roman used to write.
507 in roman numerals is DVII
109 in Roman numerals is CIX.
453 in Roman numerals is CDLIII.