To subtract 1 kilogram from 200 grams, we need to convert both units to the same unit of measurement. Since 1 kilogram is equal to 1000 grams, we can subtract 1000 grams from 200 grams to get -800 grams. However, negative mass does not make sense in reality, so we need to convert -800 grams to -0.8 kilograms. Therefore, 200 g minus 1 kg is equal to -0.8 kg.
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