The Roman numeral MCMXXX corresponds to the Arabic number 1930.
MCMXXX = 1930
Symbols are written and read from left to right, from highest to lowest.
If number MCMXXX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1930.
MCMXXIX is number 1929
MCMXXXI is number 1931
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