Two and one tenth.
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21 = 10101
heyy the answer is 21/100 :)
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.
21-1.45
21/10