1680 is an integer and not a fraction. However, it can be expressed in rational form as 1680/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
Any number can be put in fraction form
40/1
In fraction form, that number would be 137662.5/100
It is: 168/1680 = 1/10 in its simplest form
358 is in its simplest form, but it is a whole number and not a fraction.
mm is not a number and so, in itself, it cannot have a fraction form.
4.75 as a mixed number with a fraction in simplest form = 43/4
A rational number
' 18 ' is not in fraction form. It looks like the job is done.
The fraction in simplest form of 3.25 is 13/4
130 is a whole number and not a fraction. It is already in simplest form.
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.