a)$3\frac{4}{5}$ +$2\frac{3}{6}$
=$\frac{19}{5}$ +$\frac{5}{4}$
=$\frac{76}{20}$ +$\frac{25}{20}$
=$\frac{101}{20}$
b)$3\frac{4}{5}$ -$2\frac{3}{6}$
=$\frac{19}{5}$ -$\frac{5}{4}$
=$\frac{76}{20}$ -$\frac{25}{20}$
=$\frac{51}{20}$
c)$\frac{93}{100}$ - ( $\frac{13}{100}$ + $\frac{17}{100}$ )
=$\frac{93}{100}$ - $\frac{30}{100}$
=$\frac{63}{100}$
d) $\frac{7}{8}$ : 2
=$\frac{7}{8}$ :$\frac{2}{1}$
=$\frac{7}{8}$ x $\frac{1}{2}$
=$\frac{7}{16}$
e)4 x $\frac{3}{1}$
=4 x 3
= 12