515 is an integer and not a fraction. However, it can be expressed in rational form as 515/1 which cannot be simplified.
5/15 = 1/3
515 in an integer, not a fraction!
515 is an integer and so there is not really a sensible way of writing it as a fraction or mixed number.
515/1 is one possible answer.
5.15 is, itself, 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 515/100. You can simplify this rational fraction if you so wish.
The lowest fraction is 80/1.
0.09 as a fraction in its lowest terms is 9/100
The lowest-term fraction can be obtained by finding the denominator and numerator by GCF. The lowest fraction can not be further reduced.
0.28 as a fraction in its lowest terms is 7/25
0.84 as a fraction in lowest terms is 21/25.
0.875 as a fraction in lowest terms is 7/8.
3.2 as a fraction in lowest terms is16/5