1. 1 12/3/03 Math warm-up Draw an example of each a line graph, bar graph, and a circle graph. (without exact numbers) Label it. When would you use a line graph? When would you use a circle graph?

2. 2 Circle Graphs Circle graphs are mostly used to compare percentages, or a “whole” Also known as pie charts.

3. 3 Steps to create a Circle Graph 1. Classify or sort your items or parts. 2. Analyze data into a frequency chart. You don’t have to use the tally marks. 3. Count up total number of items or parts. 4. Write fractions comparing each part to the total.

4. 4 Steps to create a Circle Graph 5. Convert fraction into percent. 6. Draw circle and represented “portions of the pie” to equal the percents figured. 7. Label the circle graph: Title, item/part per pie piece with the %. You may want to use a key to show the raw data.

5. 5 Circle Graph Example You have a bag of M&M candies and you want to know how many M&Ms there are of each color and you are asked to show the data in a circle graph. Raw Data: 20 brown, 120 red, 100 green, 80 yellow, 20 orange, 60 blue

6. 6 Circle Graph Example 1. Your data has already been given to you. 2. Table your data: Color of M&M Amount Red120 Green100 Yellow 80 Blue 60 Orange 20 Brown 20 3. Total M&M = 400

7. 7 Circle Graph Example 4. Write fractions to compare parts to total: Red 120Green 100Yellow 80 400 400 400 Blue 60Orange 20 Brown 20 400 400 400

8. 8 Circle Graph Example 5. Convert fractions to percent Red 120 = N 12 = N 6 = N N=40 400 100 40 100 20 100 or 40% Green 100=N 1 = N 400 100 4 100 N=25 or 25% Yellow 80 = N 8 = N 400 100 40 100 N=20 or 20% Blue 60 = N 6 = N 3 = N 400 100 40 100 20 100 N=15 or 15% Brown & 20 = N 2 = N 1 = N Orange 400 100 40 100 20 100 N=5 or 5%

9. 9 Circle Graph Example 6. Draw a Circle with representative pie slices. Red 30% Green 25% Yellow 20% Brown & Orange each 5% 7. Label the Circle Graph Blue 15% M&Ms in a Bag