6 75/21 = 9 4/7.
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Fraction = 6/8 = 3/4 Percentage = 75%
6/21 = 2/7
7 x 3 = 21... 21 - 6 = 15... 15 x 5 = 75.
6/21 = 2/7 = 0.2857(just divide the 6 and 21 by 3 and you have your answer.)
It is: 6/21 = 2/7 in its simplest form