It's already a decimal in its simplest form
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5.15 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 515/100 which can be simplified to 5 3/20.
It is already in its simplest form as a decimal but if you mean as an improper fraction then it is -77/20 in its simplest form
It is already a decimal as 0.12 which as a fraction in its simplest form is 3/25
121 is already in the simplest form. It can be written as 0.047619 in decimal form (rounded to 6 decimal places).
15.45 is a decimal fraction and, being a decimal representation, it IS in its simplest form. The equivalent rational fraction is simplest form is 309/20.