$$5\frac{1}{2}\div880$$
$\frac{1}{160}=0.00625$
$$\frac{5\times 2+1}{2\times 880}$$
$$\frac{10+1}{2\times 880}$$
$$\frac{11}{2\times 880}$$
$$\frac{11}{1760}$$
$$\frac{1}{160}$$
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$\frac{1}{2 ^ {5} \cdot 5} = 0.00625$
