Page 298 - Basic College Mathematics with Early Integers

4
Decimals

4.1 Introduction to Decimals
4.2 Adding and Subtracting Decimals
4.3 Multiplying Decimals and
Circumference of a Circle
4.4 Dividing Decimals
Integrated Review—Operations
on Decimals
4.5 Fractions, Decimals, and Order
of Operations
4.6 Square Roots and the Pythagorean
Theorem

1
Decimal numbers represent parts of a whole, just like fractions. For example, one penny is 0.01 or of a dollar.
100
In this chapter, we learn to perform arithmetic operations on decimals and to analyze the relationship between
fractions and decimals. We also learn how decimals are used in the real world. Vocabulary Check
Chapter Highlights
Chapter Review
he secret of chocolate began with the Maya, who discovered that the cacao seed
could be made into a frosty, spicy drink. Later, the Aztecs also consumed Chapter Test
Tthis bitter brew made from the cacao seed. Chocolate made its way to
Cumulative Review
Europe when the Spanish conquered Mexico in 1521. For centuries, because
of the high cost of producing cacao and the cost of sugar, chocolate remained
a luxury enjoyed among the wealthy. This changed when the Industrial
Revolution brought
Hershey Chocolate Bar Prices for Select Years about machinery that
made producing large
amounts of choco-
late possible. The cir-
cle graphs at left
$ 0.02 $ 0.05 $ 0.05 show the price of the
Hershey Chocolate
Bar for the selected
9
1908 ( oz) 1930 (2 oz) 1950 (1 oz)
16 years shown. Here,
each whole circle rep-
resents a whole dol-
lar,or $1.00.
$ 0.10 $ 0.45 $ 0.59
In Section 4.2,
Exercises 87 through
92, we explore some
1970 (1≈ oz) 1990 (1.65 oz) 2009 (1.55 oz)
major consumers of
Source: The Hershey Company chocolate.

275