The so-called reduction means that the numerator and denominator are divided by a non-zero integer at the same time. Of course, this integer must be able to divide the numerator and denominator.
For example
96/128
Both the numerator and denominator are divided by 4, that is, 96÷4
=
< p>24, 128÷4=
32, that is
96/128
= (96÷4)/( 128÷4)
=
24/32
=
(24÷8)/(32÷8)
=
3/4