The Roman numeral DCCCXLII corresponds to the Arabic number 842.
DCCCXLII = 842
Symbols are written and read from left to right, from highest to lowest.
If number DCCCXLII is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 842.
DCCCXLI is number 841
DCCCXLIII is number 843
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