it's 49 over 81. prime numbers can't be reduced. you're welcome.
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The simplest form for 81 over 90 is 9/10
17/81 is in its simplest form.
25/81
8/81 is already in simplest form. The only common factor between 8 & 81 is 1.
63 ÷ 9 = 7 81 ÷ 9 = 9 Thus giving 7 over 9 as the simplest form