4/9 + 3/4 = 16/36 + 27/36 = 43/36 = 1 7/36
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-3/4 + -7/12 = (-3×3)/(4×3) + -7/12 = -9/12 + -7/12 = (-9 + -7)/12 = -16/12 = (-4×4)/(3×4) = -4/3 = -1 1/3.
1/12 + 4/6 = 1/12 + 8/12 = 9/12 = 3/4.3 over 4 is 1 over 12 plus 4 over 6.
2 over 3 plus 5 over 9 equals 11 over 9 or 1 and 2 ninths.
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12
8/9