90 is an integer, not a fraction.
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0.90 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 90/100 which can be simplified. But simplification means that you lose information about the precision of the fraction.
90 is an integer and not a fraction. However, it can be expressed in rational form as 90/1.
To convert 90 minutes to hours, you divide by 60 (since there are 60 minutes in an hour). So, 90 minutes is equal to 1.5 hours. To represent this as a fraction, you can write it as 1.5/1, which simplifies to 3/2 in fractional form. So, the fraction for 90 minutes in terms of hours is 3/2.
0.411111111111111 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 411111111111111/1000000000000000.
75/90 if it repeats, 8333/10000 if it doesn't.