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Charting Historical
Gas Prices

Subjects

• Educational Technology
• Mathematics
  --Algebra
  --Applied Math
  --Statistics

Grade

• 6-8
• 9-12

Brief Description

Students create a graph to illustrate the historical actual price vs. the inflation-adjusted price of a gallon of gasoline.

Objectives

Students

• observe and talk about historical data that shows the price of a gallon of gasoline over the years.
• use an online tool to find the inflation-adjusted cost of a gallon of gasoline over the years.
• create a graph to provide a visual representation of the actual cost vs. the inflation-adjusted cost of a gallon of gasoline.
• reflect on what they learned by creating their graphs.

Keywords

graph, chart, table, gasoline, inflation, actual cost

Materials Needed

• gasoline cost data (provided)
• computer access (for access to an online inflation calculator; this could be done in a computer lab or as a whole-class activity in the single-computer classroom)
• graph paper

Lesson Plan

Did you know that gasoline costs less in 2005 than it did in 1980? Impossible, you say! That is the case, though, when prices are adjusted for inflation.

Back in 1980, a gallon of gas cost about $1.13.

More recently, in 2005 a gallon of gas cost $1.66.

Yes, $1.66 is more than $1.13, but when the rate of inflation is figured in, the cost of a gallon of gas in 1980 was $2.59 (in 2005 dollars).

You can use an online inflation calculator to verify that.

Note: Different inflation calculators might vary in the results they present. The results will depend upon the data that supports them. If you calculate the adjusted-for-inflation value in 2005 of $1.13 in 1980, results on the calculator above might vary slightly from those presented by calculator 2 or calculator 3.

Introduce to students the data below, which shows the average price of a gallon of gasoline from 1950 to 2005.

If you have access to computers or a computer lab, let students use one of the inflation calculators above to calculate the inflation-adjusted cost (value compared to the value of the 2005 dollar) of a gallon of gasoline. Create a chart to show that. Depending on the calculator you use, the results should look something like this:

Now it's time for students to graph their results.

Note: If you teach upper elementary or middle school students, you might collect and plot fewer points of data than if you teach high school students.

• Across the horizontal X axis mark the years at equal intervals. If you are plotting all of the data above you will need to create a graph that marks 12 points from 1950 to 2005. If you teach younger students you might have them plot data for fewer years; for example, for 1965, 1975, 1985, 1995, and 2005.
• Across the vertical Y axis mark the values at equal intervals. If you are plotting all of the data on the table above, your Y values will need to range from $ 0.00 to $3.00. If you are plotting only the years that end in 5 from 1965 to 2005, your range will only need to extend from $ 0.00 to $2.00.

The resulting graphs (which will look something like a less-detailed version of the one at http://inflationdata.com/Inflation/images/
charts/InfAdjGas1918_2005.gif) will give student a visual representation of the price of gasoline over the years. They will see from the graph that while the actual price of a gallon of gasoline has increased, the cost of a gasoline adjusted for inflation has not increased as steadily. Bottom line, people today are not necessarily using more of their weekly paycheck to pay for gasoline than they might have used 40 years ago.

Assessment

Have students write in their journals a brief explanation of what they learned from doing this activity.

Lesson Plan Source

EducationWorld.com

Submitted By

Gary Hopkins

National Standards

MATHEMATICS: Number and Operations
GRADES 6 - 8
NM-NUM.6-8.1 Understand Numbers, Ways of Representing Numbers, Relationships Among Numbers, and Number Systems
GRADES 9 - 12
NM-NUM.9-12.1 Understand Numbers, Ways of Representing Numbers, Relationships Among Numbers, and Number Systems

MATHEMATICS: Algebra
GRADES 6 - 8
NM-ALG.6-8.3 Use Mathematical Models to Represent and Understand Quantitative Relationships
NM-ALG.6-8.4Analyze Change in Various Contexts
GRADES 9 - 12
NM-ALG.9-12.3 Use Mathematical Models to Represent and Understand Quantitative Relationships
NM-ALG.9-12.4 Analyze Change in Various Contexts

MATHEMATICS: Data Analysis and Probability
GRADES 6 - 8
NM-DATA.6-8.3 Develop and Evaluate Inferences and Predictions That Are Based on Data
GRADES 9 - 12
NM-DATA.9-12.3 Develop and Evaluate Inferences and Predictions That Are Based on Data

MATHEMATICS: Connections
GRADES Pre-K - 12
NM-CONN.PK-12.3 Recognize and Apply Mathematics in Contexts Outside of Mathematics

MATHEMATICS: Representation
GRADES Pre-K - 12
NM-REP.PK-12.1 Create and Use Representations to Organize, Record, and Communicate Mathematical Ideas
NM-REP.PK-12.3 Use Representations to Model and Interpret Physical, Social, and Mathematical Phenomena

TECHNOLOGY
GRADES K - 12
NT.K-12.1 Basic Operations and Concepts
NT.K-12.3 Technology Productivity Tools
NT.K-12.5 Technology Research Tools

See more Lesson Plans of the Day in our Lesson Plan of the Day Archive. (There you can search for lessons by subject too.)

For additional math lesson plans, see these Education World resources:

• Lesson Planning: Math
• Math Subject Center
• Teacher-Submitted Lesson Plans: Math
• Calculator Lessons from Texas Instruments
• Math Cross Puzzles
• It All Adds Up Puzzles
• Work Sheets from Teacher Created Materials: Math

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Originally published 04/10/2006
Last updated 04/24/2009