Convert Units of Weight & Mass 4-123
Generalize from converting units of length, to converting units of weight and mass. 18 pounds is how many ounces? Start with the unit rate. Since 1 lb = 16 oz, 18 lb = 18 x 16 oz = 288 oz. Alternatively, 1 lb = 16 oz, so 6 lb = 96 oz, and 18 lb = 3 x 96 oz = 288 oz. Think proportionally and use partial products to multiply.
