450 = 900/2
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350 grams.
800 grams is larger ! Half a kilo = 500g
One kilogram equals 1,000 grams. One-half of a kilogram equals 500 grams. 500 grams minus 380 grams equals 120 grams. 380 grams is 120 grams less than half a kilogram.
12.50 grams for a silver half dollar
Divide mg by 1,000 to get the same mass in grams. 1,000 mg = 1 gram 900 mg = 0.9 gram