\(\dfrac{3}{6}= \dfrac{3:3}{6:3}= \dfrac{1}{2}\); \(\dfrac{18}{24} = \dfrac{18:6}{24:6} = \dfrac{3}{4}\);
\(\dfrac{5}{35}= \dfrac{5:5}{35:5} = \dfrac{1}{7}\); \(\dfrac{40}{90} = \dfrac{40:10}{90:10}= \dfrac{4}{9}\);
\(\dfrac{75}{30} = \dfrac{75:15}{30:15} = \dfrac{5}{2}\).