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One gram is 1000 milligram. One kilogram is 1000 grams.

Another way to put it, one milligram is 1/1000 grams; one gram is 1/1000 kilograms.

So 500mg * 1g/1000mg * 1kg/1000g = 500kg/1000000 = 5kg/10000 = 0.0005 kilograms

That would be the same as moving the decimal point 6 places to the left: 3 for the mg-to-g, 3 more for g-to-kg.

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16y ago

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