0.9 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 9/10 which cannot be simplified.
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9 is an integer and not a fraction.
9/14 is in its simplest form.
9/7 is in its simplest form.
9/8 is in its simplest form.
0.9 percent as fraction in simplest form is 9/100