4.355555 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 equivalent, in rational form, is 4355555/1000000. You can simplify this rational fraction if required.
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Any number can be put in fraction form
mm is not a number and so, in itself, it cannot have a fraction form.
358 is in its simplest form, but it is a whole number and not a fraction.
The fraction in simplest form of 3.25 is 13/4
7.5 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. As a mixed number, it is 7 1/2.