Page 310 - Basic College Mathematics with Early Integers

S E C T ION 4 .1 I INTRODUCTION TO DECIMALS 287

Round each number to the given place value. See Example 18.

79. At the time of this writing, the Apple MacBook Air is 80. A large tropical cockroach of the family Dictyoptera
the thinnest Mac in production.At its thinnest point, is the fastest-moving insect.This insect was clocked at
it measures 0.4064 cm. Round this number to the a speed of 3.36 miles per hour. Round this number to
nearest tenth. (Source: Apple, Inc.) the nearest tenth. (Source: University of California,
Berkeley)

81. Michael Phelps of the United States won the gold 82. The population density of the state of Arkansas is
medal for the 200 m butterfly in the 2008 Beijing 54.444 people per square mile. Round this population
Summer Olympics with a record time of 1.8672 density to the nearest tenth. (Source: U.S. Census
minutes. Round this time to the nearest hundredth of Bureau)
a minute. (Source: International Olympic Committee)
Blytheville
Arkansas
Arkansas
55
40
Fort Smith North
Little Rock 40 West Memphis
Little Rock

Arkadelphia
30
Hope

83. A used biology textbook is priced at $67.89. Round 84. A used office desk is advertised at $19.95 by
this price to the nearest dollar. Drawley’s Office Furniture. Round this price to the
nearest dollar.

85. Venus makes a complete orbit around the Sun every 86. The length of a day on Mars, a full rotation about its
224.695 days. Round this figure to the nearest whole axis, is 24.6229 hours. Round this figure to the nearest
day. (Source: National Space Science Data Center) thousandth. (Source: National Space Science Data
Center)

Review

Perform each indicated operation. See Sections 1.3 and 1.4.

87. 3452 + 2314 88. 8945 + 4536
89. 82 - 47 90. 4002 - 3897

Concept Extensions

Solve. See the Concept Check in this section.
91. 2849.1738 rounded to the nearest hundred is 92. 146.059 rounded to the nearest ten is
a. 2849.17 c. 2850 a. 146.0 c. 140
b. 2800 d. 2849.174 b. 146.1 d. 150