Answer
0.00045 kg
Work Step by Step
$1~g = 1000 ~mg$
$1~kg = 1000~g$
$1~kg = 1,000,000~mg$
To convert from units of $mg$ to units of $kg$, we need to move the decimal point 6 places to the left.
$450 ~mg = 0.00045 ~kg$
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