Page 251 - NUMINO TG_6A
P. 251
Activity 2 Constructing Circle Graphs
jOb ective Use percentage skills to construct circle graphs, and learn how to determine angles when
building circle graphs.
1. Textbook Instructions Activity 2 Contructing Circle Graphs
In this activity, students will use the skills they The table shows students’ favorite subjects in Jessica’s class. Complete the
have already learned about percentages, but will
now apply it to circle graphs. Circle graphs table and make a circle graph.
introduce a new operation, converting
percentages into degrees for the purpose of What you need: Protractor
constructing a circle.
Favorite Subjects
Have students fill in the table and answer the
questions. Solve this portion of the problem Subject Number of Students Percent(%) Degrees
for students. Science 6 30 108
Example: Find the degrees of 30% on a circle
graph. Physical Education 3 15 54
Convert the percentage to a decimal. Math 8 40 144
30% 0.3
Multiply 0.3 by 360 , the total number of Social Studies 2 10 36
degrees in a circle.
0.3 360 108 Others 1 5 18
Repeat this process for all other
percentages. Find the percent of the students for each subject.
The percent of the students who chose science.
Total number of students: 6 3 8 2 1 = 20
6 100 = 30 %
20
Multiply each percent by 360 , the number of degrees in a circle, to find the
degrees of each sector.
Science: 360 30% = 360 0.3 = 108
Math: 360 40% = 360 0.4 = 144
Make a circle graph using the table above.
Others Favorite Subjects
5%
Social Studies
10%
Science
30%
Math Physical
40%
Education
15%
142
2. Build Understanding
To ensure efficient and correct construction of a circle graph, remind students:
1. Calculate the degree value of each percentage first, write them down, then begin constructing the graph.
2. Use a protractor to help construct a neat circle, rather than drawing a circle freehand.
3. Construct the graph in the same order that each value exists on the table. A graph that’s constructed from
least to greatest or greatest to least will be harder to read when compared to the table.
234 NUMINO Teacher s Guide
jOb ective Use percentage skills to construct circle graphs, and learn how to determine angles when
building circle graphs.
1. Textbook Instructions Activity 2 Contructing Circle Graphs
In this activity, students will use the skills they The table shows students’ favorite subjects in Jessica’s class. Complete the
have already learned about percentages, but will
now apply it to circle graphs. Circle graphs table and make a circle graph.
introduce a new operation, converting
percentages into degrees for the purpose of What you need: Protractor
constructing a circle.
Favorite Subjects
Have students fill in the table and answer the
questions. Solve this portion of the problem Subject Number of Students Percent(%) Degrees
for students. Science 6 30 108
Example: Find the degrees of 30% on a circle
graph. Physical Education 3 15 54
Convert the percentage to a decimal. Math 8 40 144
30% 0.3
Multiply 0.3 by 360 , the total number of Social Studies 2 10 36
degrees in a circle.
0.3 360 108 Others 1 5 18
Repeat this process for all other
percentages. Find the percent of the students for each subject.
The percent of the students who chose science.
Total number of students: 6 3 8 2 1 = 20
6 100 = 30 %
20
Multiply each percent by 360 , the number of degrees in a circle, to find the
degrees of each sector.
Science: 360 30% = 360 0.3 = 108
Math: 360 40% = 360 0.4 = 144
Make a circle graph using the table above.
Others Favorite Subjects
5%
Social Studies
10%
Science
30%
Math Physical
40%
Education
15%
142
2. Build Understanding
To ensure efficient and correct construction of a circle graph, remind students:
1. Calculate the degree value of each percentage first, write them down, then begin constructing the graph.
2. Use a protractor to help construct a neat circle, rather than drawing a circle freehand.
3. Construct the graph in the same order that each value exists on the table. A graph that’s constructed from
least to greatest or greatest to least will be harder to read when compared to the table.
234 NUMINO Teacher s Guide
