Common Denominators: One of the denominators is the common denominator

$\frac{1}{2}+\frac{3}{8}=$

$\frac{7}{8}$

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

$1$

$\frac{2}{3}+\frac{1}{6}=$

$\frac{5}{6}$

$\frac{2}{4}+\frac{1}{8}=$

$\frac{5}{8}$

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

$\frac{8}{10}$

$\frac{1}{3}+\frac{3}{6}=$

$\frac{5}{6}$

$\frac{3}{4}+\frac{1}{8}=$

$\frac{7}{8}$

$\frac{1}{4}+\frac{6}{12}=$

$\frac{9}{12}$

$\frac{2}{6}+\frac{4}{12}=$

$\frac{8}{12}$

$\frac{1}{3}+\frac{2}{9}=$

$\frac{5}{9}$

$\frac{1}{4}+\frac{5}{8}=$

$\frac{7}{8}$$$$$$$

$\frac{1}{3}+\frac{4}{9}=$

$\frac{7}{9}$

$\frac{1}{4}+\frac{4}{8}=$

$\frac{6}{8}$

$\frac{1}{2}+\frac{3}{10}=$

$\frac{8}{10}$

$\frac{1}{5}+\frac{2}{15}=$

$\frac{5}{15}$

$\frac{1}{3}+\frac{5}{9}=$

$\frac{8}{9}$

$\frac{1}{4}+\frac{6}{8}=$

$1$

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

$\frac{7}{10}$

$\frac{3}{5}+\frac{2}{15}=$

$\frac{11}{15}$

$\frac{3}{5}-\frac{3}{10}=$

$\frac{3}{10}$