#### Answer

0.9 g

#### Work Step by Step

900 mg to g
Unit for the answer (g) is in numerator; unit being changed (mg) is in denominator so it will divide out. The unit fraction is $\frac{1 g}{1000 mg}$.
Multiply 900 mg times to the unit fraction
900 mg * $\frac{1 g}{1000 mg}$ = 0.9 g