They would have to convert to same denominators to add. So that would be 8 twelfths plus three twelfths. And that is eleven twelfths. 0.916666667
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Eleven twelfths.
1/4 + 1/6 = 3/12 + 2/12 = 5/12
One third plus one third equals two thirds.
It equals 3 eighths.
2/3 + 1/5 = 10/15 + 3/15 = 13/15