You just need to add a hyphen. The spelling is then twenty-four.
120.24 = one hundred twenty and twenty-four hundredths.
Four hundred twenty-one.
Vingt-quatre
The spelling of the number is "twenty-four" (and no hundredths). In US currency, this would be "twenty-four dollars" (and no cents).
Expressed in words, the number 24 is written twenty-four.
twenty four point twenty four
The number 429 is "four hundred twenty-nine."For a year, or a street address, it is simply four twenty-nine or four-two-nine."
It can be written four hundred twenty-five, or if you prefer four hundred and twenty-five.For the year, it is typically "four twenty-five." A street address or suite number may be four twenty-five or four-two-five.
The number 4124 is "four thousand one hundred twenty-four."
The number 224 is written or spoken "two hundred twenty-four."
The number 422 is spelled or spoken "four hundred twenty-two."
The number 8421 is spelled "eight thousand four hundred and twenty-one."