1) 30 * 1/32;

1) $30 \cdot \frac{1}{32} = \frac{30}{32} = \frac{15}{16}$ 2) $\frac{3}{33} \cdot 15 = \frac{1}{11} \cdot 15 = \frac{15}{11} = 1 \frac{4}{11}$ 3) $\frac{2}{11} \cdot \frac{2}{3} = \frac{4}{33}$ 4) $\frac{33}{41} \cdot \frac{1}{2} = \frac{33}{82}$ 5) $\frac{35}{4} \cdot \frac{2}{135} = \frac{35 \cdot 2}{4 \cdot 135} = \frac{70}{540} = \frac{7}{54}$ 6) $\frac{39}{4} \cdot \frac{2}{75} = \frac{39 \cdot 2}{4 \cdot 75} = \frac{39}{150} = \frac{13}{50}$ 7) $5 \frac{4}{9} \cdot 6 \frac{3}{7} = \frac{49}{9} \cdot \frac{45}{7} = 7 \cdot 5 = 35$ 8) $9 \frac{1}{3} \cdot 3 \frac{3}{4} = \frac{28}{3} \cdot \frac{15}{4} = 7 \cdot 5 = 35$ 9) $15 : \frac{5}{12} = 15 \cdot \frac{12}{5} = 3 \cdot 12 = 36$ 10) $\frac{14}{23} : 20 = \frac{14}{23} \cdot \frac{1}{20} = \frac{14}{460} = \frac{7}{230}$ 11) $\frac{3}{4} : \frac{9}{10} = \frac{3}{4} \cdot \frac{10}{9} = \frac{1}{2} \cdot \frac{5}{3} = \frac{5}{6}$ 12) $1 \frac{3}{10} : 2 \frac{1}{2} = \frac{13}{10} : \frac{5}{2} = \frac{13}{10} \cdot \frac{2}{5} = \frac{26}{50} = \frac{13}{25}$