LD is the same as ld and in ancient Rome it would have represented 500-50 = 450
But in todays modern notation of Roman numerals 450 = CDL
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450 but in today's modern notation it is written out as CML
Conventionally 450 in Roman numerals is CDL.But there is an argument to suggest that the Romans themselves would have written 450 simply as LD (-50+500 = 450).
No,decimal numbers and whole numbers are not counted in Roman Numerals,ROman nUmerals are meant only for natural Numbers.
Roman numerals were invented because in the roman times they did not have numbers so these were their numbers
Yes, the Etruscans invent the Roman Numbers.