If a fraction's numerator and denominator have no factors other than one in common, the fraction cannot be simplified except if the denominator is 1, in which case the fraction can be simplified to the whole number of the numerator.
If the numerator and denominator of a fraction have a common factor (except for '1'), divide both numerator and denominator by their common factor. The fraction is in the simplest form when the numerator and denominator have no common factors.
If the numerator and the denominator have no common factors other than one, the fraction is already in its simplest form.
Where the numerator and denominator have no further common factors
The fraction is in its simplest form.
You search for common factors in the numerator and the denominator. Then you divide numerator and denominator by this common fraction. For example, in the fraction 9/12, the common factor is 3. If you divide numerator and denominator (top and bottom) by 3, you get 3/4, which is an equivalent fraction.
A simplified fraction is one in which the numerator and denominator have no factor, other than 1, in common. It is obtained by dividing both, the numerator and denominator, by any common factors.
That IS the reduced or simplified fraction.
It is a fraction in its reduced or simplest from.
This isn't a question. But, if you are asking if you can reduce a fraction when the numerator and denominator have no common factors, the answer is no.
a common numerator is a fraction result to common denominator