19/28 is in the lowest form
15/28 is in its simplest form.
28 / 197 .... it does not reduce
28% = 28/100 = 7/25 in its lowest terms
28 over 21 = 4/3
47/28 is already in its lowest terms
28/63=4/9
28/32 = 7/8 in its lowest terms
60
9/28 is 9 over 28's lowest term .
28 over 252 (28/252) in lowest terms is 1/9
27 over 28 is already in lowest terms as a fraction.