CDXLIII
400 is 100 less than 500 = C before D
40 is 10 less than 50 = X before L
3 is 1 + 1 + 1 = III
Nowadays 443 as a Roman numeral is considered to be CDXLIII but the ancient Roman would have notated it quite differently
CDXLIII
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
The roman numeral for the number 3479 is: (III)CDLXXIX