Roman ' D ' = 500.
For a number over 500, write ' D ', then follow it with the amount over 500.
For example:
To write 511, (recalling that ' X ' = 10, and ' I ' = 1),
D X I
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On converting between Arabic and Roman Numbers ,we get : 571 IN ROMAN NUMERALS is written as : DLXXI
D/X = L which is the same as 500/10 = 50
On converting between Arabic and Roman Numbers ,we get : 500 IN ROMAN NUMERALS is written as : D
Either "500 mg" or "0.5 g".
1-10 you write with letters and 11+ you write with numerals. Your welcome!! ;)