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Study Guides > Prealgebra

Introduction to Writing and Identifying Characteristics of Decimals

A gas station sign is shown. It lists unleaded as 3.999, mid-grade as 4.099, and premium as 4.199. The price of a gallon of gasoline is written as a decimal number.
Gasoline prices change 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 section, we'll explore decimal numbers and how to perform operations using them.  

Learning Outcomes

By the end of this section, you will be able to:
  • Name decimals
  • Write decimals
  • Convert decimals to fractions or mixed numbers
  • Locate decimals on the number line
  • Order decimals
  • Round decimals
   

readiness quiz

Before you get started, take this readiness quiz.
  1. Name the number 4,926,0154,926,015 in words.If you missed this problem, review [link].
  2. Round 748748 to the nearest ten.If you missed this problem, review [link].
  3. Locate 310\frac{3}{10} on a number line.If you missed this problem, review [link].
 

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