[tex]\frac{5}{9} = \frac{5\cdot4}{9\cdot4} = \frac{20}{36}\\\\\frac{7}{12} = \frac{7\cdot3}{12\cdot3} = \frac{21}{36}\\\\\frac{4}{18} = \frac{4\cdot2}{18\cdot2} = \frac{8}{36}\\\\\frac{3}{4} = \frac{3\cdot9}{4\cdot9} = \frac{27}{36}\\\\\frac{1}{2} = \frac{1\cdot18}{2\cdot18} = \frac{18}{36}\\\\\frac{2}{3} = \frac{2\cdot12}{3\cdot12} = \frac{24}{36}[/tex]
