$2\ \frac{1}{3}+\ \frac{2}{3}\ =$  

(a)  

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

(a)  

 $\frac{5}{6}\ +\ \frac{2}{10}\ +\ \frac{1}{5}\ =$  

(a)  

 $3\ \frac{1}{2}\ +\ 4\ \frac{2}{3}\ =$  

(a)  

 $\frac{9}{13}-\ \frac{5}{13}$  

(a)  

 $7\ \frac{6}{\ 8\ }\ -\ 5\ \frac{2}{8}$  

(a)  

 $\frac{2}{3}\ -\ \frac{3}{7}$  

(a)  

 $11\ \frac{1}{5}\ -\ 5\ \frac{4}{5}=$  

(a)  

 $15\ \frac{4}{\ \ 5\ }\ -\ 7\ \frac{7}{10}\ =$  

(a)