1/7 + 3/14:
you must have a common denomiantor! here, that's 14:
1(2)/14 + 3(1) /14
2/14 + 3/14
(2+3)/14
5/14.
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14/15 - 3/5 14/15 - 9/15 5/15 = 1/3
9/1418/2890/14027/42
3/7 + 5/14 = 6/14 + 5/14 = 11/14
1 and 4 elevenths ,or 126 over 77
To divide fractions you actually multiply by the reciprocal so its 9/14.