12 , 1/3 , 7/4
Least common denominator = 12
12= 12/1 = (12*12) / (1*12) = 144/12
1/3 = (1 * 4 ) / (3 * 4 ) = 4/12
7/4 = (7 *3) / (4*3) = 21/ 12
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