2.5 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 25/10 which can be simplified to 5/2.
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It is:-76/25 as a fraction in its simplest form
1.32 in a fraction as simplest form = 33/25
1.32 as a fraction in simplest form is 33/25
0.16 as a fraction in simplest form is 4/25.
0.64 as a fraction in simplest form is 16/25