7/189 + 108/189 = 115/189
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(63/4) / (15/8) = (27/4) / (13/8) = (27/4)*(8/13) = 54/13 = 42/13
17/27 - 13/27 = 4/27 or four twenty-sevenths. Expressed as a decimal, this is equal to 0.148 recurring (that is, 0.148148148...)
27/108 = 1/4
9/8 + 14/3 = 27/24 + 112/24 = 139/24 = 5 and 19/24
4-27/11 equals -23/11