3.16 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, in decimal form, it cannot be simplified. Its rational equivalent is 316/100 which can be simplified to 79/25. But simplification means that you lose information about the precision of the fraction.
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2/316 cannot be expressed as an improper fraction.
316.00
0.76 = 19/25 as a fraction simplified
6.6 as a simplified fraction is 33/5
6.15 is a fraction. It is a fraction in decimal form but that does not stop it being a fraction. And, as a decimal fraction, it cannot be simplified. Its rational equivalent is 615/100 which can be simplified to 123/20.