Fifteen
The number 90 is written out in words as such: ninety. You should spell out a number rather than write it in number form in particular scenarios, such as if you are beginning a sentence with a number.
Forty million
Eighteen billion.
The number 400 is written in words as four hundred.
You write the number in words >:D
Write out the number 32 as thirty two (in words).
You write it: twelve
So for example if you wanted to write 4 in words it would be four.
Fifteen
twelve
Nineteen.
two...
Fifty.
eleven
fortyeight
Point two two five seven is in words. It is written because after decimal we write each number as single number.