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📚 Prealgebra 2e
Chapters ▾
1 Whole Numbers2 The Language of Algebra3 Integers4 Fractions5 Decimals6 Percents7 The Properties of Real Numbers8 Solving Linear Equations9 Math Models and Geometry10 Polynomials11 Graphs

Chapter 5: Decimals

A gas station sign is shown. It lists unleaded as 3.999, mid-grade as 4.099, and premium as 4.199.
Figure 5.1 The price of a gallon of gasoline is written as a decimal number.The price of a gallon of gasoline is written as a decimal number. (credit: Mark Turnauckus, Flickr)

Gasoline price changes all the time. They might go down for a period of time, but then they usually rise again. One thing that stays the same is that the price is not usually a whole number. Instead, it is shown using a decimal point to describe the cost in dollars and cents. We use decimal numbers all the time, especially when dealing with money. In this chapter, we will explore decimal numbers and how to perform operations using them.