The Roman numeral MCDXC corresponds to the Arabic number 1490.
MCDXC = 1490
Symbols are written and read from left to right, from highest to lowest.
If number MCDXC is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1490.
MCDLXXXIX is number 1489
MCDXCI is number 1491
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