The Roman numeral CCCXLII corresponds to the Arabic number 342.
CCCXLII = 342
Symbols are written and read from left to right, from highest to lowest.
If number CCCXLII is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 342.
CCCXLI is number 341
CCCXLIII is number 343
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