450 CHAPTER 7 The Metric System 39. A fish tank is shown below. a) What is its volume in cubic centimeters? 180 000 cm3 b) What is its volume in cubic meters? 0.18 m3 c) How many milliliters of water will the tank hold? 180 000 m d) How many kiloliters of water will the tank hold? 0.18 k 40 cm 90 cm 50 cm 40. A square kilometer is a square with length and width both 1 km. How many times larger is a square kilometer than a square dekameter? 10,000 times larger 7. 4 In Exercises 41–50, change the given quantity to the indicated quantity. When appropriate, round answers to the nearest hundredth. Use Table 7.7 on pages 439– 440. 41. 41 kg = _______ lb 90.39 42. 18 cm = _______ in. 7.09 43. 37 yd = _______ m 33.83 44. = 100 m _______ yd 109.36 45. = 52 mi _______ km 83.68 46. = 27 _______ qt 28.53 47. = 20 gal _______ 75.71 48. = 60 m _______ 3 yd3 78.47 49. = 96 cm _______ 2 in.2 14.88 50. = 4 qt _______ 3.79 In Exercises 51–57, when appropriate, round your answers to the nearest hundredth. 51. Pediatrician’s Office At a pediatrician’s office, a 9-year-old measured 137 cm and weighed 44.2 kilograms. a) What is the height in inches? 53.94 in. b) What is the weight in pounds? 97.44 lb 52. Distance Traveled The distance from Dallas, Texas, to Houston, Texas, is 241 miles. Determine this distance in kilometers. 387.84 km 53. Carpeting a Room Irene is buying new carpet for her rectangular family room. The room is 15 ft wide and 24 ft long. The carpeting is sold only in square meters. How many square meters of carpeting will she need? 33.44 m2 54. Water Tank A cylindrical water tank can store 50,000 gal of water. a) Determine the volume in kiloliters. 189.27 k b) Determine the weight of the water in kilograms. 189 270 kg 55. Speed Limit The speed limit on a road in Canada is 70 kilometers per hour. What is the speed limit in a) miles per hour? 43.50 mi/hr b) meters per hour? 70 000 m/hr 56. A Water Tank A rectangular tank used to test leaks in tires is 90 cm long by 70 cm wide by 40 cm deep. a) Determine the number of liters of water the tank holds. 252 b) What is the mass of the water in kilograms? 252 kg 57. Oranges If the cost of oranges is $3.50 per kilogram, determine the cost of 1 lb of oranges. $1.59 per pound Test CHAPTER 7 When appropriate, round your answers to the nearest hundredth. 1. Convert 2400 to k . 2.4 k 2. Convert 46.2 cm to hm. 0.004 62 hm 3. How many times greater is a kilometer than a dekameter? 100 times greater 4. Jogging A high school track is an oval that measures 400 m around. If Savannah jogs around the track six times, how many kilometers has she gone? 2.4 km In Exercises 5–9, choose the best answer. 5. The width of a page in a hardbound book is about a) 5 cm. b) 20 cm. c) 60 cm. (b) 6. The surface area of the top of a kitchen table is about a) 2 m .2 b) 200 cm .2 c) 2000 cm .2 7. The amount of gasoline that an automobile’s gas tank can hold is about a) 200 . b) 20 . c) 75 . (c) (a)
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