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0.55 = 55/100 which simplifies to 11/20
It is any fraction of the form (22*k)/(55*k) where k is a non-zero integer, or a common factor of the two.
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.
0.0055 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. Its rational equivalent is 55/10000 which can be simplified.
55 when written as a fraction, is 55/1 ... already as reduced as it can get.