Final answer:
To convert milligrams to grams, you divide the number of milligrams by 1000.
Step-by-step explanation:
To convert milligrams (mg) to grams (g), you need to divide the number of milligrams by 1000. In this case, the pharmacist wrote a prescription for 200 mg, so to convert this to grams, you divide 200 by 1000: 200/1000 = 0.2 g. Therefore, the pharmacy technician will need 0.2 grams to fill the order.