Basic Mathematics for College Students

Graph each number on a number line.See Example 6.

61. 0.8, 4.5,

62. 0.6, 3.5,

63. 2.75,

64. 4.15,

Round each decimal number to the indicated place value.
See Example 7.

65. 506.198 nearest tenth


66. 51.451 nearest tenth


67. 33.0832 nearest hundredth


68. 64.0059 nearest hundredth


69. 4.2341 nearest thousandth


70. 8.9114 nearest thousandth


71. 0.36563 nearest ten-thousandth


72. 0.77623 nearest ten-thousandth

Round each decimal number to the indicated place value.
See Example 8.

73. nearest hundredth


74. nearest hundredth


75. nearest tenth


76. nearest tenth


77. 3.14959 nearest thousandth


78. 9.50966 nearest thousandth


79. 1.4142134 nearest millionth


80. 3.9998472 nearest millionth


81. 16.0995 nearest thousandth


82. 67.0998 nearest thousandth


83. 290.303496 nearest hundred-thousandth


84. 970.457297 nearest hundred-thousandth

Round each given dollar amount.See Example 9.

85. $0.284521 nearest cent


86. $0.312906 nearest cent


87. $27,841.52 nearest dollar


88. $44,633.78 nearest dollar

3,987.8911

2.718218

808.0897

0.137

− 5 − 4 − 3 − 2 −10 12 34 5

3.19,0.27,3.95, 1.66

− 5 − 4 − 3 − 2 −10 12 34 5

1.21,3.29,4.25, 1.84

− 5 − 4 − 3 − 2 −10 12 34 5

0.3,2.7, 2.2

− 5 − 4 − 3 − 2 −10 12 34 5

0.7,3.1, 3.9

APPLICATIONS

89. READING METERS To what decimal is the arrow
    pointing?


90. MEASUREMENT Estimate a length of 0.3 inch on
    the 1-inch-long line segment below.


91. CHECKING ACCOUNTS Complete the check
    shown by writing in the amount, using a decimal.


92. MONEY We use a decimal point when working
    with dollars, but the decimal point is not necessary
    when working with cents. For each dollar amount
    in the table, give the equivalent amount expressed
    as cents.

PAY TO THE

ORDER OF

Ellen Russell455 Santa Clara Ave.

Parker, CO 25413

One thousand twenty-five and DOLLARS

, 20

Citicorp $

April 14 10

45-828-02-33-4660

___ 78

100

BAP.O. Box 2456Downtown Branch

Colorado Springs,CO 23712

MEMOMortgage

0

–1

–0.5 0.5

+1

4.1 An Introduction to Decimals 327

Dollars Cents

$0.50

$0.05

$0.55

$5.00

$0.01

93. INJECTIONS A syringe is shown below. Use an
    arrow to show to what point the syringe should be
    filled if a 0.38-cc dose of medication is to be given.
    (“cc” stands for “cubic centimeters.”)


94. LASERS The laser used in laser vision correction is
    so precise that each pulse can remove 39 millionths
    of an inch of tissue in 12 billionths of a second. Write
    each of these numbers as a decimal.

.1 .2 .3 .4 .5 cc