cdxc
400+90
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.
In todays notation of Roman numerals they represent 490
On Converting between Arabic and Roman Numbers we get: 490 in roman numerals is written as : CDXC where 400=CD XC=90.
490 is an even number.
CDXC
Under today's rules 490 expressed in Roman numerals is CDXC but the Romans themselves would have probably preferred XD.
CDXC
it is 494 D=500 XD=490 V=5 IV=4 XDIV=494
XD = 490
It was the equivalent of 490 in the times of the ancient Romans but the modern way of writing 490 in Roman numerals is now CDXC
It is 490 when rounded to the nearest whole number and not 489
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