0.4 kg.
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There are 1000000 milligrams in a kilogram. Therefore 40 milligrams is 0.00004 kilograms.
There are 1000000 milligrams in a kilogram. Therefore 0.67 kilograms is 670,000 milligrams.
There are 1000000 milligrams in a kilogram. This means there are 3,200,000 milligrams in 3.2 kilograms.
2500 milligrams = 2.5 grams = .0025 kilograms
400,000 pounds converts to 181,437 kilograms.