The Roman numeral CCCXLV corresponds to the Arabic number 345.
CCCXLV = 345
Symbols are written and read from left to right, from highest to lowest.
If number CCCXLV is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 345.
CCCXLIV is number 344
CCCXLVI is number 346
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