63/81 = 7/9 in its lowest term.
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3/4
63/147 = 3/7
7/9
63/180 = 21/60. This can be further reduced by dividing both numerator and denominator by 3, resulting in 7/20. Since 7 is a prime number, this is the lowest possible reduction for this fraction.
63/100 is the simplest form for your fraction.