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Anonymous
1000 g = 1 kg so 400 g = 400/1000 = 0.4 kg. Simple!
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Kilogram means 1000 grams; to convert from grams to kilograms, you divide by 1000.
1000 grams = 1 kilogram so 400 grams = 400/1000 = 0.4 kilograms. Simple!