4/3 plus -1/3 = 1
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3 2/3 ; three and two thirds
5 and four-thirds, ie six and one-third.
Three thirds
The sum of -2/3 and -4/5 is -1 7/15
Add negative eleven to negative four and one third to obtain negative fifteen and one third: (-11) + (-4 1/3) = -15 1/3