Answer
$1\times10^{-6}kg$
Work Step by Step
To convert mg to kg you need a unit fraction that has mg in the denominator and kg in the numerator.
$1mg\times\frac{1\times10^{-3}g}{1mg}\times\frac{1\times10^{=3}kg}{1g}=1\times10^{-6}kg$
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