0.55 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, being a decimal, there is no simpler form. Its rational equivalent is 55/100 which can be simplified to 11/20.
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It is already in its simplest form as 55/36
Expressed as a proper fraction in its simplest form, 55 percent is equal to 11/20 or eleven twentieths.
It is: 55/8
That would be 13/50 in its simplest form.
As an improper fraction in its simplest form: 3.4375 = 55/16