It is 3/13.
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negative -1/2+-1/2 = -1
1/2 = 0.503/13 = 0.23therefore, 1/2 is greater than 3/13.
Expressed as a proper fraction in its simplest form, 1/3 + 2/5 = 11/15 or eleven fifteenths.1/3 + 2/55/15 + 6/1511/155/15 + 6/15 = 11/15
If you mean: -1/9 plus -5/9 then it is equal to -6/9 which simplifies to -2/3
13 and 5/8 plus 7/8 = 13 and 12/8, or 14 and 1/2