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

$b)\frac{4}{7}+\frac{6}{7}=\frac{10}{7}=1\frac{3}{7}$

$c)\frac{3}{8}+\frac{7}{8}=\frac{10}{8}=1\frac{2}{8}=1\frac{1}{4}$

$d)\frac{10}{13}+\frac{7}{13}=\frac{17}{13}=1\frac{4}{13}$

$e)\frac{13}{30}+\frac{23}{30}=\frac{36}{30}=1\frac{6}{30}=1\frac{1}{5}$  

$f)\frac{27}{50}+\frac{27}{50}=\frac{54}{50}=1\frac{4}{50}=1\frac{2}{25}$