\(\frac{15}{30}=\frac{15:15}{30:15}=\frac{1}{2}\)
\(\frac{20}{25}=\frac{20:5}{25:5}=\frac{4}{5}\)
\(\frac{18}{18}=1\)
\(\frac{25}{45}=\frac{25:5}{45:5}=\frac{5}{9}\)
\(\frac{15}{30}=\frac{1}{2}\)
\(\frac{20}{25}=\frac{4}{5}\)
\(\frac{18}{18}=1\)
\(\frac{25}{45}=\frac{5}{9}\)