$4\frac{3}{5}$ = $\frac{9\times 4 + 3}{5}$ = $\frac{23}{5}$
$6\frac{2}{7}$ = $\frac{6\times 7 + 2}{7}$ = $\frac{44}{7}$
$12\frac{2}{3}$ = $\frac{12\times 3 + 2}{3}$ = $\frac{38}{3}$
$5\frac{3}{10}$ = $\frac{5\times 10 + 3}{10}$ = $\frac{53}{10}$
$4\frac{3}{5}$ = $\frac{9\times 4 + 3}{5}$ = $\frac{23}{5}$
$6\frac{2}{7}$ = $\frac{6\times 7 + 2}{7}$ = $\frac{44}{7}$
$12\frac{2}{3}$ = $\frac{12\times 3 + 2}{3}$ = $\frac{38}{3}$
$5\frac{3}{10}$ = $\frac{5\times 10 + 3}{10}$ = $\frac{53}{10}$