What number should be added to `8/9` to get `9/8` ?

(i) What number should be added to 5/12 to get 2""3/8 ? (ii) What number should be subtracted from 5 to get 1""5/13 ?

What number should be added to (-5)/7 to get (-2)/3?

What number should be added to (-5)/7 to get (-2)/3?

What should be added to -6/8 to get 5/6 ?

What number should be added to (-5)/8 so as to get 5/9 ?

What number should be added to (-7)/8 so as to get 5/9?

What number should be added to (-5)/8 so as to get 5/9\ ?

What number should be added to (-7)/8 so as to get 5/9?

What should be added to 2/5 to get -1 ?

What should be added to 63.47 to get 91 ?