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$\displaystyle \frac{3}{12}+ \frac{25}{30}= \frac{1}{4}+ \frac{5}{6}= \frac{3+10}{12}= 1\frac{1}{12}$

$\displaystyle \frac{10}{24}+ \frac{21}{54}= \frac{5}{12}+ \frac{7}{18}= \frac{15+14}{36}= \frac{29}{36}$

$\displaystyle \frac{30}{54}+ \frac{22}{30}= \frac{5}{9}+ \frac{11}{15}= \frac{25+33}{45}= 1\frac{13}{45}$

$\displaystyle \frac{28}{40}+ \frac{10}{75}= \frac{7}{10}+ \frac{2}{15}= \frac{21+4}{30}= \frac{25}{30}= \frac{5}{6}$

$\displaystyle \frac{12}{27}+\frac{14}{21}= \frac{4}{9}+ \frac{2}{3}= \frac{4+6}{9}=1 \frac{1}{9}$

$\displaystyle \frac{14}{24}+ \frac{15}{40}= \frac{7}{12}+ \frac{3}{8}= \frac{14+9}{24}= \frac{23}{24}$

$\displaystyle \frac{12}{18}+ \frac{5}{60}= \frac{2}{3}+ \frac{1}{12}= \frac{8+1}{12}= \frac{9}{12}= \frac{3}{4}$

$\displaystyle \frac{4}{24}+ \frac{3}{36}= \frac{1}{6}+ \frac{1}{13}= \frac{13+6}{78}= \frac{19}{78}$