Is it good to write roman numbers in a essay or should i spell it out?

Generally, the rule is to write out numbers less than 10...otherwise, I would probably just write regular numbers...not sure why you would need roman numbers....Is it good to write roman numbers in a essay or should i spell it out?
When in Rome, do as the Romans do.





Use Roman numerals when referring to something that uses them (';Super Bowl XLII';) or when are quoting a source that uses Roman numerals.





Otherwise, use our standard (Arabic) number system.





Spell out the numbers one through ten. Spell out numbers at the beginning of a sentence (';One hundred and thirty years ago...';).





When referencing or quoting, keep to the style of the source (it's Heller's Catch-22 but Orwell's Nineteen Eighty-Four).Is it good to write roman numbers in a essay or should i spell it out?
The rule of thumb is that anything over 10 gets put in number. If you choose to use Roman numerals, I would write them in parenthesis. So, for example if it's XXI century, you would write it as XXI (21st) century. Also, only use Roman numerals if you have to. If it's not required for the paper, stick to numbers one through nine written and then anything above 10 in numbers.
I think that it depends on how long the number is. One of my English professors told me that if a number is less than three characters long then you write out the number, however if it's three numbers long you're allowed to use numerals.





So that would mean for numbers 0--99 you have to write them out, and for numbers 100--to infinity you can use numbers.





It's a really weird rule when you think about it...
If it requires roman numerals use them if not spell them out. It depends on what you are writing about.
write them out
Don't spell them out.