Definition/Procedure Example We can use unit fractions to convert between the two measurement systems. (p. 604) Change 20 in. to cm. Multiply the given measurement of 20 in. by the unit fraction relating inches and centimeters so that inches will divide out and leave us with centimeters. 20 in. 2.54 cm 1 in. 20 in. 1 2.54 cm 1 in. Divide out the unit of inches. 50.8 cm 1 Multiply. 50.8 cm Simplify. Therefore, 20 in. 50.8 cm. Changing from F to C Use this formula to change a Fahrenheit temperature (F) to Celsius (C). C 5(F 32) 9 (p. 607) Convert 95F to Celsius. C 5(F 32) 9 5(95 32) 9 5(63)7 91 35 Therefore, 95F 35C. Changing from C to F Use this formula to change a Celsius temperature (C) to Fahrenheit (F). F 9C 5 32 (p. 607) Convert 11C to Fahrenheit. F 9C 5 32 9(11) 5 32 99 5 32 19.8 32 51.8 Round the answer to the nearest degree: 51.8F 52F. Therefore, 11C 52F. Chapter 7: Review Exercises (7.1) Fill in the blank. 1) ft 1 yd 2) 1 pt c 3) 1 lb oz 4) min 1 hr 5) To convert from seconds to minutes, do we use multiplication or division? Explain your answer. 6) To convert from feet to inches, do we use multiplication or division? Explain your answer. Use multiplication or division to convert to the indicated unit. 7) 10 qt to gallons 8) 52 oz to pounds 9) 1 1 4 days to hours 10) 3.5 ft to inches Use unit analysis to convert to the indicated unit. 11) 7 min to seconds 12) 81 in. to feet 13) 5 pt to quarts 14) 4.6 hr to minutes 15) 6 2 3 yd to feet 16) 630 in. to yards Solve each problem. 17) Vlad is comparing two brands of hot dogs. The label for Brand A says that its unit cost is $3.49/lb. The unit cost for Brand B is $0.24/oz. Which is the better buy? 18) It takes Helen 20 min to crochet each square for an afghan. How many hours will it take for her to make the 96 squares she needs for the blanket? (7.2) Fill in the blank. 19) 1 m cm 20) 1 km m 21) mm 1 m 22) mm 1 cm For Exercises 23 and 24, determine which unit of metric length would be most appropriate for each situation. Choose from m, mm, cm, and km. 23) The distance between New York City and Los Angeles 24) The length of a key 618 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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