CCCXL = 340
340
311
CCCXL
Nowadays the equivalent of 340 as a Roman numeral is CCCXL but the ancient Romans would have notated it as CCCXXXX
340 is CCCXL
988 = CMLXXXVIII in Roman numerals
it means 1,150 in roman numerals
Those Roman Numerals mean 1991.
Not a valid sequence for Roman numerals
It does not mean anything because it is an invalid arrangement of Roman numerals
"D" in Roman Numerals equals 500.
Roman numerals don't have a 0 symbol and so it is an invalid arrangement of Roman numerals