Answer
690 mg
Work Step by Step
We know that 1 g = 10 dg
We know that 1 g = 1000 mg
We can convert 6.9 dg to units of mg.
$6.9~dg = \frac{6.9~dg}{1}\times \frac{1~g}{10~dg}\times \frac{1000~mg}{1~g}$
$6.9~dg = 690~mg$
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