a) 

$\frac{4}{5}+\frac{1}{10}=\frac{8}{10}+\frac{1}{10}=\frac{9}{10}$

b)

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

c) 

$\frac{8}{9}-\frac{1}{3}=\frac{8}{9}-\frac{3}{9}=\frac{5}{9}$

d)

$1\frac{3}{10}-\frac{1}{5}=1\frac{3}{10}-\frac{2}{10}=1\frac{1}{10}$ $1\frac{3}{10}-\frac{1}{5}=1\frac{3}{10}-\frac{2}{10}=1\frac{1}{10}$

e)

$\frac{2}{3}+\frac{1}{5}=\frac{10}{15}+\frac{3}{15}=\frac{13}{15}$

f)

$\frac{4}{7}+\frac{1}{2}=\frac{8}{14}+\frac{7}{14}=\frac{15}{14}=1\frac{1}{14}$

g)

$2\frac{2}{5}+3\frac{1}{2}=2\frac{4}{10}+3\frac{5}{10}=5\frac{9}{10}$

h)

$4\frac{3}{7}+2\frac{2}{3}=4\frac{9}{21}+2\frac{14}{21}=6\frac{23}{21}=7\frac{2}{21}$

i)

$\frac{4}{5}-\frac{2}{3}=\frac{12}{15}-\frac{10}{15}=\frac{2}{15}$

j)

$\frac{5}{7}-\frac{1}{4}=\frac{20}{28}-\frac{7}{28}=\frac{13}{28}$

k)

$2\frac{3}{8}-1\frac{1}{6}=2\frac{9}{24}-1\frac{4}{24}=1\frac{5}{24}$

l)

$4\frac{1}{2}-2\frac{3}{5}=3\frac{3}{2}-2\frac{3}{5}=3\frac{15}{10}-2\frac{6}{10}=1\frac{9}{10}$

m)

$4\frac{1}{4}-2\frac{2}{3}=3\frac{5}{4}-2\frac{2}{3}=3\frac{15}{12}-2\frac{8}{12}=1\frac{7}{12}$

n)

$5\frac{1}{9}-1\frac{5}{6}=4\frac{10}{9}-1\frac{5}{6}=4\frac{20}{18}-1\frac{15}{18}=3\frac{5}{18}$

o)

$2\frac{1}{15}-\frac{1}{10}=\frac{31}{15}-\frac{1}{10}=\frac{62}{30}-\frac{3}{30}=\frac{59}{30}=1\frac{29}{30}$

p)

$5\frac{5}{13}-3\frac{1}{2}=4\frac{18}{13}-3\frac{1}{2}=4\frac{36}{26}-3\frac{13}{26}=1\frac{23}{26}$