d. 5 gr = mg e. 7 12 gr = mg f. 0.4 mg = gr 3. Ratio and proportion. Remember: 1 g or 1000 mg = 15 gr; 60 (65) mg = 1 gr a. Change 5 g to gr_ b. Change 120 mg to gr Volume: Metric, Apothecary, and Household Conversion 4. To convert liters and quarts to ounces, (multiply/divide) the number of liters by ; to convert ounces to liters and quarts, (multiply/divide) the number of ounces by a. 3L= fl oz b. 1 12 qt = OZ c. 64 fl oz = d. 1/2 L = OZ e. 8 oz = L or qt f. 24 OZ = .qt 5. To convert ounces to milliliters, (multiply/divide) the number of ounces by _; to convert milliliters to ounces, (multiply/divide) the number of milliliters by (multiply/divide). a. 1 12 OZ = ml b. 15 ml = fl oz c. 60 ml = OZ d. 75 ml = OZ e. 3 fl oz = _ml f. 8 oz = ml