Eighty and four hundred fifty-three thousandths.
Five millionths.
The number 90,000,000,000 is written in words as "ninety billion."
Two hundred-thousandths.
Twenty-five millionths.
Three and sixty-three hundredths.
The number 10.20 is written in words as "ten point two zero".
The correct way to say it is eighty and four hundred fifty three thousandths.
Standard form:h+3 written in words: h added to three
As written, the answer appears to be "with your mouth." If this is not a meaningful answer, ask the question again using words that convey your meaning.
Using the right words - leaves the reader in no doubt of what the writer is trying to say.
The number 3,000,146 is written in words as "three million one hundred forty-six."
The number 11.210 is written as "eleven and twenty-one hundredths".