Add the following rational numbers:
(i) 
and
(ii) 
and
(iii) 
and
(iv) 
and
(i) Clearly,
Denominators of the given numbers are positive
The L.C.M of denominator 7 and 7 is 7
We have,
+ 
= 
= 
(ii) Clearly,
Denominators of the given numbers are positive
The L.C.M of denominator 4 and 4 is 4
We have,
+ 
= 
= 
= -2
(iii) Clearly,
Denominators of the given numbers are positive
The L.C.M of denominator 11 and 11 is 11
We have,
+
= 
= 
(iv) Clearly,
Denominators of the given numbers are positive
The L.C.M of denominator 13 and 13 is 13
We have,
+ 
= 
= 
2