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If you mean what fraction of 1 kg is 0.4 kg then it's 2/5 or 20%
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= 0.45 kilograms 450g as a fraction of a kilogram = 9/20 kilogram or simply 9/20kg
4/20 = 1/5
400 grams is 0.4 of a kilogram.
6.31
0.6 kg