13/15 is in its simplest form.
I have no clue
Since the numerator of the fraction is prime, you know that the fraction 13/15 is in its simplest form.
30 over 26 in simplest form = 15/13
13/15 is in its simplest form.
234/270 in simplest form is 13/15
180/156 = 15/13
13/15
13/15
13/15
13/15
13/15