426 CHAPTER 7 The Metric System 22. A ruler is about how wide? a) 4 mm b) 4 cm c) 4 dm (b) 23. A very tall Ferris wheel is about how high? a) 168 cm b) 168 m c) 168 km (b) 24. The diameter of a coffee cup is about which of the following? a) 8 mm b) 8 cm c) 8 dm (b) In Exercises 25–30, indicate the metric unit of measurement you would use to express the area of the following. 25. Carpeting in a room Square meters 26. A computer monitor’s screen Square centimeters 27. A national park hectares or square kilometers 28. A building lot for a house Square meters or hectares 29. A postage stamp Square centimeters or square millimeters 30. Disney World Square kilometers or hectares In Exercises 31–36, choose the best answer. 31. A credit card has an area of about a) 50 cm .2 b) 50 mm .2 c) 50 dm .2 (a) 32. The area of a city lot is about a) 800 m .2 b) 800 hm .2 c) 800 cm .2 (a) 33. The area of a city lot is about a) m . 1 8 2 b) ha. 1 8 c) dam . 1 8 2 (b) 34. The area of one side of a nickel is about a) 3 cm .2 b) 3 m .2 c) 3 mm .2 (a) 35. The area of a slice of bread is about a) 100 cm .2 b) 100 mm .2 c) 100 m .2 (a) 36. The area of the Great Smoky Mountains National Park is about a) 2100 m .2 b) 2100 cm .2 c) 2100 km .2 (c) In Exercises 37– 44, determine the metric unit that would best express the volume of the following. 37. Liquid in an eye dropper Milliliters 38. Water in a hot-water heater Liters 39. Water flowing over Niagara Falls per minute Kiloliters 40. A child’s pail filled with beach sand Cubic centimeters 41. A clothing closet Cubic meters 42. Air in a hot air balloon Cubic meters 43. A truckload of top soil Cubic meters 44. Air in a soccer ball Cubic centimeters In Exercises 45–52, choose the best answer to indicate the volume of the following. 45. A desk drawer a) 7780 mm3 b) 7780 dm3 c) 7780 cm3 (c) 46. Water that could fill an Olympic-size swimming pool a) 2500 k b) 2500 c) 2500 m (a) 47. The volume of a typical living room a) 45 km3 b) 45 m3 c) 45 cm3 (b) 48. A carry-on suitcase a) 0.04 cm3 b) 0.04 mm3 c) 0.04 m3 (c) 49. Juice that can be squeezed out of an orange a) 120 k b) 120 m c) 120 (b) 50. The air in a basketball a) 6370 m3 b) 6370 mm3 c) 6370 cm3 (c) 51. Soda in a full soda can a) 355 b) 355 m c) 355 m3 (b) 52. Water in a 24-ft-diameter above-ground circular swimming pool a) 55 b) 55 m c) 55 k (c) In Exercises 53– 60, fill in the missing values. 53. = 1 cm mm 2 2 100 54. = 1 dam dm 2 2 10 000 Sirchitvises/123RF
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