Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger one.
→ MCMXXIV = 1000 + (-100 + 1000) + 10 + 10 + (-1 + 5) = 1924
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M represents 1000, X is 10, V is 5, I is 1 and C is 100. This would convert to 1924.
It is MM.
As written 'mcmlxxx' it is meaningless. Roman Numerals are ALWAYS CAPITAL letters ; MCMLXXX MCMLXXX = 1980.
It is: 205 = CCV in Roman numerals
To write three million in Roman numerals, you would use the numeral "M" for a thousand, repeated three times to represent three thousand. Then, you would add the Roman numeral for a million, which is a bar over the numeral "M" (written as "M̅"). Therefore, three million in Roman numerals is written as MMMM̅.
We do use Roman numerals today. For example, Roman numerals are often found in making outlines; to label book chapters; to label the frontmatter (pages) in books.