To write 9.9 in words, you would write "nine point nine." This notation indicates the number 9 followed by a decimal point and then the number 9, which represents a fraction of a whole number. The word "point" is used to separate the whole number from the decimal portion in the written form.
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Generally speaking, when writing out numbers in words between 21 and 99 in English, hyphens are used between the tens digit and units digit. This contrasts with a language such as Italian, where numbers between 21 and 99 are written as single words, without hyphens, for example, the word for the number 32 is trentadue.
9÷9+99 or 99+9÷(9)
99/9 + 9 = 20
9 and 99/100
Expanded Notation of 99 = (9 x 101) + (9 x 100)