\(\dfrac{9}{4}-\dfrac{4}{5}=\dfrac{45}{20}-\dfrac{16}{20}=\dfrac{29}{20}\)
\(\dfrac{5}{8}+\dfrac{9}{4}=\dfrac{5}{8}+\dfrac{18}{8}=\dfrac{23}{8}\)
\(1-\dfrac{2}{9}=\dfrac{9}{9}-\dfrac{2}{9}=\dfrac{7}{9}\)
\(\dfrac{4}{7}+5=\dfrac{4}{7}+\dfrac{35}{7}=\dfrac{39}{7}\)
\(\dfrac{9}{5}.\dfrac{3}{5}=\dfrac{27}{25}\)
\(\dfrac{5}{8}.2=\dfrac{10}{8}=\dfrac{5}{4}\)
\(\dfrac{4}{3}:\dfrac{3}{5}=\dfrac{4}{3}.\dfrac{5}{3}=\dfrac{20}{9}\)
\(\dfrac{5}{7}:3=\dfrac{5}{7}.\dfrac{1}{3}=\dfrac{5}{21}\)
\(4:\dfrac{3}{5}=4.\dfrac{5}{3}=\dfrac{20}{3}\)
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