Page 323 - Basic College Mathematics with Early Integers

300 C HAPTE R 4 I DECIMALS

Find the unknown length in each figure.

99. 100.
5.26 7.82 ?
meters meters meters
2.3 inches 2.3 inches
?
17.67 meters

10.68 inches

Let’s review the values of these common U.S. coins in order to answer the following exercises.

Penny Nickel Dime Quarter

$0.01 $0.05 $0.10 $0.25

For Exercises 101 and 102, write the value of each group of coins.To do so, it is usually easiest to start with the coin(s) of
greatest value and end with the coin(s) of least value.

101. 102.

103. Name the different ways that coins can have a 104. Name the different ways that coin(s) can have a
value of $0.17 given that you may use no more value of $0.25 given that there are no pennies.
than 10 coins.

105. Why shouldn’t the sum 106. Laser beams can be used to measure the distance
to the moon. One measurement showed the
82.95 + 51.26
distance to the moon to be 256,435.235 miles.
be estimated as 90 + 60 = 150? A later measurement showed that the distance is
See the second Concept Check in this section. 256,436.012 miles. Find how much farther away the
moon is in the second measurement as compared to
the first.

107. Explain how adding or subtracting decimals is similar to adding or subtracting whole numbers.
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108. Can the sum of two negative decimals ever be a positive decimal? Why or why not?