Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 4.5, 4.5/90 is equal to 1/20 or one twentieth.
28 over 90 in its simplest form is 14 over 45.
45/4
90/2842 = 45/1421
98/90 = 49/45 = 14/45
64/90 = 32/45
38 over 45
16/45
90/112=45/56
2/45
38/45
256/45
1/2