$$\frac{ 1 }{ 3 } \times \sqrt{ 0.81 }$$
$0.3$
$$\frac{1}{3}\times 0.9$$
$$\frac{1}{3}\times \frac{9}{10}$$
$$\frac{1\times 9}{3\times 10}$$
$$\frac{9}{30}$$
$$\frac{3}{10}$$
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$\frac{3}{2 \cdot 5} = 0.3$