MCMLXXX is the Roman numeral for the number 1980.
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In Roman numerals, 1980 is written as MCMLXXX.
MCMLXXX is the number 1980 in roman numerals. The XXX in last is to add 30 to make the last numbers 80.
1980 is MCMLXXX
MCMVXXX is 1980.
1980 = MCMLXXX 1971 = MCMLXXI