Lesson Plan

Teacher: Mrs. D. Roberts

Course: Math Unit: Percents

Lesson Title: Percents and Circle Graphs

Grade level: 7^{th or} 8^th grade

Supplies needed: Protractors, compasses, calculators, and computer lab

Which Performance Descriptor(s) are you focusing on in this lesson? Standard 6C-Stage H- Select, use, and justify appropriate operations, methods, and tools to compute or estimate with real numbers Standard 6D-Stage G- Work flexibly with fractions, decimals, and percents to solve number sentences and word problems Standard 7A-Stage F-Measure, with a greater degree of accuracy, any angle using a protractor or angle ruler Standard 7C-Stage H-Solve problems involving angle measurements in polygons and circles Standard 9A-Stage G-Draw geometric shapes with specified properties, such as side lengths or angle measures Standard 10A-Stage F-construct, read, interpret, infer, predict, draw conclusions, and evaluate data from various displays, including circle graphs Standard 10B-Stage G-Choose and use appropriate techniques to gather data

For this lesson students will gather data, find the percent of each piece of the data, and then construct a circle graph with this data. We will then use Excel to input the same data and construct a circle graph on the computer.

Part 1: Classroom

1. Students will gather data

§ Have students gather data with their own class as a whole group (some examples of data to gather may be: favorite type of fries- curly, skinny, fat, chili, cheese or favorite type of movie-scary, romantic, comedy, action)

§ Next have students gather data in other nearby classrooms, with different groups going to different classrooms (arrange this ahead of time with your neighboring teachers) I have students start working with a partner at this point

§ Compile the data in one big chart -either on an overhead or on the board

2. Students will convert the data to percentages

§ Students will need to find the total number of students surveyed

§ Divide the number for each set of data by the total number of students surveyed

§ Change that decimal to a percent (some rounding may have to take place, but make sure at the end that the percentages round up to 100%- if not, make adjustments)

3. Students will use percentages to find out what size each section in the circle graph needs to be

§ A circle contains a total of 360 degrees

§ Use the percentages for each set of data-multiply the percent times 360 to find out how many degrees needed for each set of data

4. Construct circle graph

§ Draw a circle with the compass

§ Draw a radius on the circle

§ Use the radius to make the first section of the circle graph- use the number of degrees calculated above and a protractor to measure the number of degrees and make an angle that size to form the first section

§ Label and color that section

§ Continue with the same procedure until all of the data is graphed

Part 2: Computer Lab

1. Students will open Excel program

§ Students will work with their partner and share a computer making sure each person gets a turn on the computer

2. Input the data

§ Students will enter the type of data in column A (ex. Curly fries, Skinny fries, etc.)

§ Students will enter the percentages for each set of data in Column B

Curly fries	25
Skinny fries	25
Fat fries	10
Cheese fries	30
Chili fries	10

3. Create a circle graph with the data

§ Highlight all of the data in both columns

§ Click on Chart Wizard (It looks like a tiny bar graph in the tool bar)

§ Choose Pie Chart, Select the type of Pie Chart (preferably the one dimensional chart-so it looks more like their chart), and then Next

§ Click on Next again (this section not needed)

§ Click on Titles tab and give your chart a name (example: Favorite Types of Fries at FJHS)

§ Click on Legend tab and decide where you want the legend located

§ Click on Data labels tab and click on show percent

§ Click on Next, click on As a New Sheet

§ Click on Finish

§ Print your graph and compare it with your hand-made graph