it means 490
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The Roman numeral CDXC represents the number 490. C (100) is subtracted from D (500) to give 400, and XC (90) is added to 400 to get 490.
Not a proper Roman numeral. D is 500. X is ten It could be 510. Or it could be in improper attempt to write 490 (which would be CDXC).
XD is not in the standard form for a Roman numeral, but I would guess its value is 490. It should be written as CDXC
CDXC
This is not a valid roman numeral!
It is: 5 = V as a Roman numeral