CXXXXV is not a correctly written Roman numeral. The individual numerals within it are real numerals but according to the rules of writing Roman numerals 'no numeral can be written more than three times in succession.' So, XXXX is not allowed. The numerals you have written add up to 145 and the correct Roman numeral for this is CXLV
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Oh, dude, you're really making me flex my brain cells here. So, C is 100, X is 10, V is 5, and we've got four X's in a row, which is 40 each. Add them up like you're counting your coins after a night out, and you get 145. So, CXXXXV in Arabic numbers is 145. Like, easy peasy, right?
That IS the roman numeral. In Arabic numbers it would be 690.
The Roman numeral of CCCL is equivalent to the Arabic numeral of 350
On Converting between Arabic and Roman Numbers ,we get : xcviii in roman numerals is : 98
Converting between Arabic and Roman Numbers we get : roman numeral of 2410 is : MMCDX
The Roman numeral MC III is equivalent to the Arabic numeral 1103.