$$( 4 ^ { - 2 } \times 16 ^ { - 2 } ) \div 2 ^ { - 2 }$$
$\frac{1}{1024}=0.000976562$
$$\frac{\frac{1}{16}\times 16^{-2}}{2^{-2}}$$
$$\frac{\frac{1}{16}\times \frac{1}{256}}{2^{-2}}$$
$$\frac{\frac{1}{4096}}{2^{-2}}$$
$$\frac{\frac{1}{4096}}{\frac{1}{4}}$$
$$\frac{1}{4096}\times 4$$
$$\frac{1}{1024}$$
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$\frac{1}{2 ^ {10}} = 0.0009765625$