7/9 + 10/11 =
First make both denominators the same:
(11/11)(7/9) + (9/9)(10/11) =
77/99 + 90/99 =
Then add the fractions.
167/99
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7 over 10 plus 7 over 10 is 14 over 10 or 1.4
7/10 + 7/10 = 7/5
3 over 7, 6 over 11, 7 over 10.
7 over 10
1/5 plus 1/7 plus 3/10 is equal to 0.642857