To do additions with mixed fractions, you should add the integer (whole) part, and the fractions, separately.
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5 over 8 + 7 over 8 = 12 over 8 or 1 1/2
9/8 or 1 and 1/8
1 and 5 over 8 plus 3 and 1 over 6 = 115/24 or 419/24
It is: 1/3+5/8 = 23/24
3/4