| a) | $$\frac{9}{150} = \frac{9:3}{150:3} = \frac{3}{50} = \frac{3 \cdot 2}{50 \cdot 2} = \frac{6}{100} = 0,06$$ |
| б) | $$\frac{21}{140} = \frac{21:7}{140:7} = \frac{3}{20} = \frac{3 \cdot 5}{20 \cdot 5} = \frac{15}{100} = 0,15$$ |
| в) | $$\frac{6}{75} = \frac{6:3}{75:3} = \frac{2}{25} = \frac{2 \cdot 4}{25 \cdot 4} = \frac{8}{100} = 0,08$$ |