Addition and subtraction of the proper and improper fractions:
 
(i) \(\frac{1}{12} + \frac{7}{12}  =\)   ii
 
(ii) \(\frac{5}{4} + \frac{3}{4}  =\) iii
 
(iii) \(\frac{9}{11} - \frac{4}{11}  =\) ii
 
(iv) \(\frac{23}{6} - \frac{11}{6}  =\) i
 
[NOTE: With Simplication]