$\frac{1}{4}+4\frac{2}{3}=\frac{3}{12}+4\frac{8}{12}=4\frac{11}{12}$  

 

$\frac{5}{6}+4\frac{2}{3}=\frac{5}{6}+4\frac{4}{6}=4\frac{9}{6}=5\frac{3}{6}=5\frac{1}{2}$   

 

$1\frac{3}{8}+4\frac{2}{3}=1\frac{9}{24}+4\frac{16}{24}=5\frac{25}{24}=6\frac{1}{24}$  

 

$4\frac{2}{9}+4\frac{2}{3}=4\frac{2}{9}+4\frac{6}{9}=8\frac{8}{9}$  

 

$5\frac{1}{12}+4\frac{2}{3}=5\frac{1}{12}+4\frac{8}{12}=9\frac{9}{12}=9\frac{3}{4}$  

 

$6\frac{7}{20}+4\frac{2}{3}=6\frac{21}{60}+4\frac{40}{60}=10\frac{61}{60}=11\frac{1}{60}$