The Roman numeral MCMLXXX corresponds to the Arabic number 1980.
MCMLXXX = 1980
Symbols are written and read from left to right, from highest to lowest.
If number MCMLXXX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1980.
MCMLXXIX is number 1979
MCMLXXXI is number 1981
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