It can be expressed three ways:
"twenty-three and a half" (5/10 = 1/2)
"twenty-three and five tenths"
"twenty-three point five"
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The number 2.35 million is written 2,350,000.
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.