$$36 = \frac{36}{1}$$
$$-45 = -\frac{45}{1}$$
$$4,2 = \frac{42}{10} = \frac{21}{5}$$
$$-0,8 = -\frac{8}{10} = -\frac{4}{5}$$
$$15 \frac{1}{6} = \frac{91}{6}$$
$$\frac{2}{9} = \frac{2}{9}$$