2.0 lbs x 453.6 g/lb x 1000 mg/g = 907,200 mg rounded to 9.1x10^5 mg = 910000 mg (2 sig figs based on the value 2.0)
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2.2 pounds = 1 kilogram = 1,000 grams = 1,000,000 milligrams 2.2 pounds = 1,000,000 milligrams 0.0000022 pounds = 1 milligram 0.0000066 pounds = 3 milligrams
One gallon of plain water weighs about 8.35 pounds which converts to 3,787,000 milligrams.
40 000 pounds
150 milligrams
453 592.37 milligrams