The Roman numeral MDCCXC corresponds to the Arabic number 1790.
MDCCXC = 1790
Symbols are written and read from left to right, from highest to lowest.
If number MDCCXC is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1790.
MDCCLXXXIX is number 1789
MDCCXCI is number 1791
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