The Roman numeral MMMDXXX corresponds to the Arabic number 3530.
MMMDXXX = 3530
Symbols are written and read from left to right, from highest to lowest.
If number MMMDXXX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 3530.
MMMDXXIX is number 3529
MMMDXXXI is number 3531
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