$5\frac{2}{3}\ -\ 2\frac{4}{21}$

The difference is approximately $???$ .

$2\frac{1}{6}\ +\ 4\frac{4}{11}$

The sum is approximately $???$ .

$1\frac{9}{10}\ -\ 1\frac{3}{8}$

The difference is approximately $???$ .

$2\frac{7}{12}\ +\ 4\frac{4}{9}$

The sum is approximately $???$ .

$20\frac{3}{4}\ -\ 18\frac{1}{3}$

The difference is approximately $???$ .

$19\frac{7}{12}\ -\ 19\frac{1}{5}$

The difference is approximately $???$ .

$7\frac{1}{2}\ \ +\ 2\frac{6}{19}$

The sum is approximately $???$ .

$17\frac{5}{6}\ +\ 2\frac{1}{2}$

The sum is approximately $???$ .

$9\frac{2}{5}\ +\ 4\frac{1}{3}$

The sum is approximately $???$ .

$2\frac{3}{5}\ -\ 1\frac{4}{9}$

The difference is approximately $???$ .