25/81
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The simplest form for 81 over 90 is 9/10
25/81 is the simplest form: The prime factors of 25 are only 5, and those of 81 are only 3. Therefore, no integer other than 1 can divide both numbers to product an integer result.
17/81 is in its simplest form.
81/25
8/81 is already in simplest form. The only common factor between 8 & 81 is 1.