\( \dfrac{3}{5} = \dfrac{\square}{20} \)
\( \dfrac{3}{5} = \dfrac{12}{20} \)
\( \dfrac{\square}{18} = \dfrac{2}{9} \)
\( \dfrac{4}{18} = \dfrac{2}{9} \)
\( \dfrac{8}{\square} = \dfrac{3.2}{4} \)
\( \dfrac{8}{10} = \dfrac{3.2}{4} \)
\( \dfrac{\square}{45} = \dfrac{16}{40} = \dfrac{24}{\square} \)
\( \dfrac{18}{45} = \dfrac{16}{40} = \dfrac{24}{60} \)
\( \dfrac{16}{36} = \dfrac{\square}{63} = \dfrac{36}{\square} = \dfrac{\square}{117} \)
\( \dfrac{16}{36} = \dfrac{28}{63} = \dfrac{36}{81} = \dfrac{52}{117} \)