There are 1000000 (a million) micrograms in every gram. So, here you have to multiply by a million. 4.5 grams x1,000,000 is 4,500,000 micrograms.
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4.25 micrograms is equal to 0.00425 milligrams.
1 mg is equal to 1000 micrograms.
One million.
900 micrograms is equal to 0.9 milligrams. To convert micrograms to milligrams, divide by 1000 since there are 1000 micrograms in a milligram.
There are 1000000 micrograms in one gram. Therefore, 20 micrograms is equal to 20/1000000 = 0.00002 grams.