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A kilogram is a thousand grams; half a kilogram is therefore 500 grams, so if you have 450 grams, you are 50 grams short of half a kilogram.
1000 grams = 1 kilogram so 50 g = 0.05 kg. Simple!
Most big books weigh a kilogram (1000 grams). Chapter books weigh roughly half a kilogram, and children's books, 50 grams.
1 gram = 1000000 micro gram 50 kilogram = 50 x 1000 x 1000000 = 50000000000 micro grams
50 lbs = 22,679.62 grams.