$$400+50+ \frac{ 9 }{ 100 } + \frac{ 1 }{ 1000 }$$
$\frac{450091}{1000}=450.091$
$$450+\frac{9}{100}+\frac{1}{1000}$$
$$\frac{45000}{100}+\frac{9}{100}+\frac{1}{1000}$$
$$\frac{45000+9}{100}+\frac{1}{1000}$$
$$\frac{45009}{100}+\frac{1}{1000}$$
$$\frac{450090}{1000}+\frac{1}{1000}$$
$$\frac{450090+1}{1000}$$
$$\frac{450091}{1000}$$
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$\frac{19 \cdot 23689}{2 ^ {3} \cdot 5 ^ {3}} = 450\frac{91}{1000} = 450.091$
