In today's notation it is: MDXLIX
In todays modern notation of Roman numerals it is: MDXLIX but the Romans themselves probably wrote it out differently
In the modern version it is now DCXLIX but the ancient Romans wrote it out quite differently
1549 is MDXLIX
the answer to what is the roman numeral for 101 is CI
'XXV' is the Roman Numeral. I think you wish to know the Arabic (Modern) number, which is '25'.
No, K is not a roman numeral.
There is not a Roman Numeral for 0.
The roman numeral for one is I.
Vivid is not a Roman numeral
V is a roman numeral representing the number 5.
M is a roman numeral that represents 1000.
The number 80 is represented by the Roman numeral LXXX