$$\frac { 4 } { 8 } \quad \frac { 15 } { 18 } \quad \frac { 18 } { 20 } \quad \frac { 18 } { 30 } \quad \frac { 120 } { 300 }$$
$\frac{9}{100}=0.09$
$$\frac{1}{2}\times \frac{15}{18}\times \frac{18}{20}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{1}{2}\times \frac{5}{6}\times \frac{18}{20}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{1\times 5}{2\times 6}\times \frac{18}{20}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{5}{12}\times \frac{18}{20}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{5}{12}\times \frac{9}{10}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{5\times 9}{12\times 10}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{45}{120}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{3}{8}\times \frac{18}{30}\times \frac{120}{300}$$
$$\frac{3}{8}\times \frac{3}{5}\times \frac{120}{300}$$
$$\frac{3\times 3}{8\times 5}\times \frac{120}{300}$$
$$\frac{9}{40}\times \frac{120}{300}$$
$$\frac{9}{40}\times \frac{2}{5}$$
$$\frac{9\times 2}{40\times 5}$$
$$\frac{18}{200}$$
$$\frac{9}{100}$$
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$\frac{3 ^ {2}}{2 ^ {2} \cdot 5 ^ {2}} = 0.09$
