2500 mg
There are 1000 milligrams in one gram, so 2.5 g would be 2500 mg. derived by multiplying 2.5 X 1000. You can just move the decimal point to the right the same number of spaces as the number of zeros in 1000 (3).
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1 gram = 1,000 = 103 milligrams
500 mg
two and five tenths milligrams
Either "500 mg" or "0.5 g".
25g