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Warm Up
Lesson Presentation
Problem of the Day
Lesson Quizzes
Reading and Interpreting Circle GraphsMarshallRocks!
Warm UpWrite each fraction as a percent.
1. 2. 3.
Write each percent as a fraction.
4. 20% 5. 25% 6.60%
75% 10% 40%34
110
25
15
14
35
Reading and Interpreting Circle GraphsMarshallRocks!
Problem of the Day
Riddle: When does 1 + 1 + 1 = 1?1 ft + 1 ft + 1 ft = 1 yd
Reading and Interpreting Circle GraphsMarshallRocks!
Learn to read and interpret data presented in circle graphs.
Reading and Interpreting Circle GraphsMarshallRocks!
Vocabulary
circle graphsector
Reading and Interpreting Circle GraphsMarshallRocks!
A circle graph, also called a pie chart, shows how a set of data is divided into parts.
The entire circle contains 100% of the data.
Each sector, or slice, of the circle represents one part of the entire data set.
Reading and Interpreting Circle GraphsMarshallRocks!
The circle graph compares the number of species in each group of echinoderms. Echinoderms are marine animals that live on the ocean floor. The name echinoderm means “spiny-skinned.”
Reading and Interpreting Circle GraphsMarshallRocks!
Use the circle graph to answer the question.
Additional Example 1A: Life Science Application
Which group of echinoderms includes the fewest number of species?
The sector for sea lilies and feather stars is the smallest, so this group includes the fewest number of species.
Reading and Interpreting Circle GraphsMarshallRocks!
Use the circle graph to answer the question.
Additional Example 1B: Life Science Application
Approximately what percent of echinoderm species are brittle stars and basket stars?
about , so approximately 33%
13
Reading and Interpreting Circle GraphsMarshallRocks!
Use the circle graph to answer the question.
Additional Example 1C: Life Science Application
Which group is made up of a greater number of species, sea cucumbers or sea stars?
The sector for sea stars is larger than the sector for sea cucumbers. This means there are more kinds of sea stars than sea cucumbers.
Reading and Interpreting Circle GraphsMarshallRocks!
Use the circle graph to answer each question.
Check It Out: Example 1A
Which size car sold the most?
Midsize
Small
LuxuryLarge
The sector for midsize cars is larger than any other of the sectors of car sizes. This means midsize cars were sold the most.
Reading and Interpreting Circle GraphsMarshallRocks!
Use the circle graph to answer each question.
Check It Out: Example 1B
Approximately what percent of cars sold were midsize?
Midsize
Small
LuxuryLarge
The midsize sector is approximately half or about 50%.
Reading and Interpreting Circle GraphsMarshallRocks!
Use the circle graph to answer each question.
Check It Out: Example 1C
Which size sold less—large or small?
Midsize
Small
LuxuryLarge
The smallest sector between Large and Small is Large. Large sized cars sold less.
Reading and Interpreting Circle GraphsMarshallRocks!
Leon surveyed 30 people about pet ownership. The circle graph shows his results. Use the graph to answer each question.
Additional Example 2A: Interpreting Circle Graphs
How many people own dogs only?
The circle graph shows that 20% of the 30 people own dogs only.
20% of 30 = 0.2 • 30
= 66 people own dogs only.
Reading and Interpreting Circle GraphsMarshallRocks!
Leon surveyed 30 people about whether they own pets. The circle graph shows his results. Use the graph to answer each question.
Additional Example 2B: Interpreting Circle Graphs
How many people own both cats and dogs?
Since 20% is 6 people, 10% is 3 people.
3 people own both cats and dogs.
Reading and Interpreting Circle GraphsMarshallRocks!
Check It Out: Example 2A
Fifty students were asked which instrument they could play. The circle graph shows the responses. Use the graph to answer each question.
How many students do not play an instrument?
piano20%
no instrument50%
flute10%
drum20%
The circle graph shows that 50% of 50 students do not play an instrument.
50% of 50 = 0.5 • 50
= 25
25 students do not play an instrument.
Reading and Interpreting Circle GraphsMarshallRocks!
Check It Out: Example 2B
Fifty students were asked which instrument they could play. The circle graph shows the responses. Use the graph to answer each question.
Ten students said they play the piano. How many play the flute?
Since 20% is 10 students, 10% is 5 students.
Five students play the flute. piano
20%
no instrument50%
flute10%
drum20%
Reading and Interpreting Circle GraphsMarshallRocks!
Decide whether a bar graph or circle graph would best display the information. Explain your answer.
Additional Example 3A: Choosing an Appropriate Graph
the percent of U.S. population living in the different states
A circle graph is the better choice because it shows how parts of a whole are divided.
Reading and Interpreting Circle GraphsMarshallRocks!
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
Additional Example 3B: Choosing an Appropriate Graph
the number of tickets sold for each night of a school play
A bar graph is the better choice because it makes it easy to see how the number of tickets sold changed over each night.
Reading and Interpreting Circle GraphsMarshallRocks!
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
Additional Example 3C: Choosing an Appropriate Graph
the comparison between the number of students in a math class and the total student population.
A circle graph is the better choice because it shows what part of the students are in a math class.
Reading and Interpreting Circle GraphsMarshallRocks!
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
Check It Out: Example 3A
the percent of people buying a certain color of a new vehicle
A circle graph is the better choice because it makes it easier to see what part (or percent) of people is buying a certain color of vehicle.
Reading and Interpreting Circle GraphsMarshallRocks!
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
Check It Out: Example 3B
the comparison of different themes voted on for a school party
A circle graph is a better choice because the sectors that represent the themes could be easily compared.
Reading and Interpreting Circle GraphsMarshallRocks!
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
Check It Out: Example 3C
the number of visitors to the Grand Canyon for the last ten years
A bar graph is the better choice because it makes it easy to see how the number of visitors has changed over the years.
Reading and Interpreting Circle GraphsMarshallRocks!
Standard Lesson Quiz
Lesson Quizzes
Lesson Quiz for Student Response Systems
Reading and Interpreting Circle GraphsMarshallRocks!
Lesson Quiz: Part IUse the circle graph to answer questions 1-4.
1. Which group of CDs sold the most?
2. What percent of the CD sales are country?
3. Which type of CD sells the least?
4. If a total of 500 CD’s are sold, how many are Jazz?
rock
27%
rap
55
41%
Reading and Interpreting Circle GraphsMarshallRocks!
Lesson Quiz: Part II
5. Would a bar or circle graph best display the sales of a department store for the last 5 months?
bar graph
Reading and Interpreting Circle GraphsMarshallRocks!
1. The members of a club were asked to vote for their favorite holiday destination. The results are shown in the form of a circle graph. Which destination was preferred the most by the members?
A. Portugal
B. FranceC. GreeceD. Spain
Lesson Quiz for Student Response Systems
Reading and Interpreting Circle GraphsMarshallRocks!
2. 300 students in a school play any one musical instrument. The circle graph shows what percentage of students play different instruments. How many students play guitar?
A. 15
B. 36C. 96D. 144
Lesson Quiz for Student Response Systems
Reading and Interpreting Circle GraphsMarshallRocks!
3. Which of the following would be the best display for the nutritional value of a food item?
A. bar graph
B. double bar graphC. histogramD. circle graph
Lesson Quiz for Student Response Systems
Reading and Interpreting Circle GraphsMarshallRocks!
