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Algebra

Rates and Taxes

9-12
This activity allows students to become familiar with percents and taxes. Students learn how to determine the amount of tax a family will pay based on a certain income. This lesson was adapted from an article by Warren W. Esty, which appeared in the May 1992 edition of Mathematics Teacher.
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Geometry

Reflect On This

9-12
This lesson, adapted from an activity in Navigating through Geometry in Grades 9‑12, requires students to investigate reflections using hinged mirrors. With a kaleidoscope, students will examine the interior angles of regular polygons.
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Algebra

Smokey Bear Takes Algebra

9-12
This lesson introduces students to the many factors that play a role in creating a forest-fire danger rating index. They will be looking at how we use a scale to quantify the abstract idea of forest fire danger. Using the real-world situation, students examine the meaning of the slope and intercepts of a line. To complete the activities related to these indexes, students should be comfortable with linear, quadratic and exponential functions and their graphs. Students’ facility with a graphing calculator is assumed. Students also use summation notation to do the activities relating to the Nesterov index. This lesson plan was adapted from the article "Smokey the Bear Takes Algebra," which appeared in the October 1999 issue of the Mathematics Teacher.
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Geometry

Trigonometry for Solving Problems

9-12
This lesson offers a pair of puzzles to enforce the skills of identifying equivalent trigonometric expressions. Additional worksheets enhance students' abilities to appreciate and use trigonometry as a tool in problem solving. This lesson is adapted from an article by Mally Moody, which appeared in the March 1992 edition of Mathematics Teacher.  
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Data Analysis and Probability

Traveling Distances

9-12
In this lesson, students interpret the meaning of the slope and y-intercept of the graph of real-life data. By examining the graphical representation of the data, students relate the slope and y-intercept of the least squares regression line to the real-life data. They also interpret the correlation coefficient of the resulting least squares regression line.
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Geometry

Euler Diagrams and Logic

9-12
This lesson focuses on using Euler diagrams to explore direct, indirect, and transitive reasoning. It was adapted from the article "A Visual Approach to Deductive Reasoning" by Frances Van Dyke, which appeared in the September 1995 issue of the Mathematics Teacher journal.
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Data Analysis and Probability

Bathtub Water Levels

9-12
This lesson is similar to Lesson One: Traveling Distances; however, this lesson is designed so students examine real-life data that illustrates a negative slope. Students interpret the meaning of the negative slope and y-intercept of the graph of the real-life data. By examining the graphical representation of the data, students relate the slope and y-intercept of the least squares regression line to the real-life data. They also interpret the correlation coefficient of the least squares regression line.
Data Analysis and Probability

My Graph Is…

9-12
This lesson is designed to allow students to select their own real-life data to plot and interpret. Interpreting the meaning of the slope and y-intercept of their least squares regression lines will help reinforce the concepts introduced in Lessons One and Two of this Unit Plan. The students are then given the opportunity to display their work.
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Data Analysis and Probability

Gallery Walk

9-12
This lesson is designed to allow students to view the work of other students in the class and to explain their own work. Some teachers may be tempted to skip this step in the Unit Plan, but it is very important that students be given the opportunity to verbalize what the mathematics means that they performed in Lesson Three.
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Data Analysis and Probability

Automobile Mileage: Year vs. Mileage

9-12
In this lesson, students plot data about automobile mileage and interpret the meaning of the slope and y-intercept in the resulting equation for the least squares regression line. By examining the graphical representation of the data, students analyze the meaning of the slope and y-intercept of the line and interpret them in the context of the real-life application. Students also make decisions about the age and mileage of automobiles based on the equation of the least squares regression line.