Neunzig
The word: "ninety" has two syllables.
fuenfundneunzig
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
sechsundneunzig, literally six-and-ninety
I've got ninety reasons!
Ninety-five point ninety-eight
Ninety-one and ninety-one thousandths.
7.91 in word form is seven and ninety-one hundredths.
The word form is: Nine hundred ninety-nine billion nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred ninety-nine.
The correct word form is: eight hundred ninety-eight and ninety-eight hundredths.
ninety-five = tish'ím v'chamésh (תשעים וחמש)