Definition/Procedure Example 7.4 Solve Applied Problems Involving Metric Units Perform Operations with Metric Units We can add, subtract, multiply, and divide numbers with metric units. Sometimes, it is necessary to express the numbers with the same units before performing the operations. (p. 599) Add 3 m 215 mm. The units are not the same, so we will convert one of the units so that it is the same as the other. Express each measurement in meters. 215 mm 0.215 m Now, add the measurements. 3 m 215 mm 3 m 0.215 m 3.215 m Express each measurement in millimeters. 3 m 3000 mm Now, add the measurements. 3 m 215 mm 3000 mm 215 mm 3215 mm Solve an Applied Problem Involving Metric Units We can solve applications involving metric units. (p. 600) The instructions on a 140-mL bottle of prescription cough medicine say to take 10 mL of the medicine two times per day until it is gone. How many days will the medicine last? First, determine how much medicine is taken per day. Then, divide the total amount of medicine, 140 mL, by the amount of medicine taken each day. Since the dosage is 10 mL twice a day, the total amount of medicine taken each day is 10 mL 2 20 mL. Divide 140 mL by 20 mL to determine the number of days the medicine will last: 140 mL 20 mL 7 The medicine will last 7 days. The check is left to the student. 7.5 Metric–U.S. Customary Conversions and Temperature We can convert between U.S. customary and metric units. (p. 604) Relationships Between U.S. Customary Units and Metric Units Length 1 in. 2.54 cm 1 yd 0.91 m 1 ft 0.30 m 1 mi 1.61 km Capacity 1 cup 236.59 mL 1 gal 3.79 L 1 qt 0.95 L Weight (Mass) 1 oz 28.35 g 1 lb 0.45 kg www.mhhe.com/messersmith CHAPTER 7 Summary 617
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