(9/2)/(54/7) = (9/2)x(7/54) = (63/108) = 21/36 = 7/12
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Three is the lowest common denominator. 21 divided by 3 = 7 54 divided by 3 = 18 21/54 = 7/18
2/7 divided by 7 is approximately 0.0408163
2 divided by 7/8 is 2.2857
7.7143
If you mean: 81/2 divided by 21/4 then it is 54/7 or 7 and 5/7