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25/81 is already a fraction written in its simplest form.
5 over 9
4 over 9
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 9, 81/90 is equal to 9/10 or nine tenths.
18/81 = 2/9 (divide top and bottom by the hcf of 18 & 81 = 9)