390
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CCCXC
390
The roman numerals for the decimal number 390 is CCCXC. C is equivalent to 100, X is 10. According to the rules, X is subtracted from the last C (100-10 = 90). The result is 100 + 100 + 100 + 90 = 390. There are several converters online that convert roman numerals to decimal numbers and vice versa.
390
In today's notation they represent 390