$$\frac{4\times10^{-5}\times1000}{0.001}$$
$40$
$$\frac{4\times \frac{1}{100000}\times 1000}{0.001}$$
$$\frac{\frac{1}{25000}\times 1000}{0.001}$$
$$\frac{\frac{1}{25}}{0.001}$$
$$\frac{1}{25\times 0.001}$$
$$\frac{1}{0.025}$$
$$\frac{1000}{25}$$
$$40$$
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$5\times 2^{3}$
