a. 2 $\frac{1}{3}$ x 5 $\frac{1}{4}$ = $\frac{7}{3}$ x $\frac{21}{4}$ = $\frac{7 x 21}{3 x 4}$ = $\frac{147}{12}$
b. 3 $\frac{2}{5}$ x 2 $\frac{1}{7}$ = $\frac{17}{5}$ x $\frac{15}{7}$ = $\frac{17 x 5}{15 x 7}$ = $\frac{85}{105}$
c. 8 $\frac{1}{6}$ : 2 $\frac{1}{2}$ = $\frac{49}{6}$ : $\frac{5}{2}$ = $\frac{49 x 2}{6 x 5}$ = $\frac{98}{30}$