Yes, if you multiply 3 by 3 you get 9 and if you meltiply 4 by 3 you get 12.
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12 over 3= 4
3/4+1/3= 9/12+4/12= 13/12
3/4 - 5/12 = 9/12 - 5/12 = 4/12 = 1/3.
11 over 12 + 1 over 3= 11 over 12 + 4 over 12 = 15 over 12 or 1 and 3 over 12 or 1 and 1 over 4
3/4 + 2/3 = (3*3)/(4*3) + (2*4)/(3*4) = 9/12 + 8/12 = 17/12 or 1 and 5/12