-0.312 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. Being a decimal, there is no simpler form. Its rational equivalent is -312/1000 which can be simplified to -39/125. But simplification means that you lose information about the precision of the fraction and end up with a clumsier number.
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183/1000
-58/25
-46% as a fraction in its simplest form is -23/50
It is -2/10 or -1/5 in its simplest form
The simplest way is to write it as -0.2 which 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 -2/10 which can be simplified, if required.