90 in Roman numerals is XC.
XC
Well, honey, you write 90 in short word form by simply saying "ninety." It's as easy as pie. No need to complicate things, just keep it short and sweet.
ninety million
90 is written as XC
You write it like this xcvi hope this helps you out
Ninety
Ninety.
Ninety-two
ninety
five and ninety hundredths
ninety million
Ninety-six.