Evaluate :

(i) $\dfrac{2}{-3} + \dfrac{-4}{9}$

(ii) $\dfrac{-1}{2} + \dfrac{-3}{4}$

(iii) $\dfrac{7}{-9} + \dfrac{-5}{6}$

(iv) $2 + \dfrac{-3}{4}$

(v) $3 + \dfrac{-5}{6}$

(vi) $-4 + \dfrac{2}{3}$

Evaluate :

(i) $\dfrac{-3}{8} + \dfrac{5}{8} + \dfrac{7}{8}$

(ii) $\dfrac{11}{3} + \dfrac{-5}{3} + \dfrac{-2}{3}$

(iii) $-1 + \dfrac{2}{-3} + \dfrac{5}{6}$

(iv) $\dfrac{7}{26} + \dfrac{-11}{13} + 2$

(v) $3 + \dfrac{-7}{8} + \dfrac{-3}{4}$

(vi) $\dfrac{-13}{8} + \dfrac{7}{16} + \dfrac{-3}{4}$

Subtract :

(i) $\dfrac{3}{5}$ from $\dfrac{1}{2}$

(ii) $\dfrac{-4}{7}$ from $\dfrac{2}{3}$

(iii) $\dfrac{-5}{6}$ from $\dfrac{-3}{4}$

(iv) $\dfrac{-7}{9}$ from 0

(v) 4 from $\dfrac{-6}{11}$

(vi) $\dfrac{3}{8}$ from $\dfrac{-5}{6}$

Evaluate :

(i) $\dfrac{5}{6} - \dfrac{7}{8}$

(ii) $\dfrac{5}{12} - \dfrac{17}{18}$

(iii) $\dfrac{11}{15} - \dfrac{13}{20}$

(iv) $\dfrac{-5}{9} - \dfrac{-2}{3}$

(v) $\dfrac{6}{11} - \dfrac{-3}{4}$

(vi) $\dfrac{-2}{3} - \dfrac{3}{4}$