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81 can be divided by 9 nine times. 9/81 = 1/9 (9 x 9 = 81)
The greatest common factor between 36 and 81 is 9. 36/9 = 4 and 81/9 = 9.36/81 = 4/9.
63 ÷ 9 = 7 81 ÷ 9 = 9 Thus giving 7 over 9 as the simplest form
-81/117 = -9/13
81 divided by 9 = 9 then 90 divided y 9 =10 answer is 9/10