CIRCLE
GRAPHS
Notes & Practice Pages
Percentages & Circle Graphs
Important Things to Remember (Fill in the blank)
Calculating Percentages
Step One: Add all data numbers together to calculate the whole total.
Example:
Ice Cream Votes For Favorite
Ice Cream
Chocolate 12
Vanilla 15
________________
________________
Strawberry 8 ________________
Cookie Dough 17
Swirl 11 Total = ______
Step Two: Divide EACH data number by ______________________. Round the
decimal to the nearest ___________________________.
Step Three: Move the decimal over TWICE & you have your percentage!
Example:
Ice Cream Equation Equals
(Nearest Hundredth)
Chocolate 12/63 0.19 = %
Vanilla 15/63 0.24 = %
Strawberry 8/63 0.13 = %
Cookie Dough 17/63 0.27 = %
Swirl 11/63 0.17 = %
Step Four: _________________________________!
Add all of your percentages together. You should get 100%!
Important Note: Because you rounded, you MAY have a 1% margin of error.
This means you could get 99% or 101% & still be okay!
Creating Circle Graphs
Step One: Use a PENCIL to divide your circle into 4 equal parts. This gives
you four 25% sections. This is a great guide to get you started.
12.5%
25%
12.5%
25% 25%
Step Two: Choose the percentage that seems to be graphed the easiest. In
our ice cream example, 24% seems to be the easiest to graph, but you
could chose whichever is easiest for you!
24%
Step Three: Continue to use the guides you have created to graph each
percentage in your data set. Here are the steps from the ice cream
example:
24%
26%
13%
Continue around the circle 17%
17%
24% using your guides to graph 24%
the pie pieces the best you 19%
19%
can until you have the most 26%
26% accurate graph as possible! 13%
13%
Step Four: Check & finalize your graph. Be sure your pie pieces look
correct. For example, if the 26% piece looks smaller than the 19% piece, you
must have done something wrong. When it looks good, color each pie
piece or provide a key so you know which pie piece represents which data.
Calculating Percentages Practice
1. The following data table lists the number of people that like each type of music.
Calculate the percentage of the people that like each type of music.
Type of Music Number of People Type of Music % of People
Rap 81 Rap
Country 57 Country
Gospel 64 Gospel
Rock 122 Rock
Heavy Metal 117 Heavy Metal
2. The following data tables list a class of votes for their favorite subjects.
Calculate the percentage of the class that likes each subject.
Class Number of Votes Class % of Votes
Math 3 Math
Science 12 Science
Language Arts 8 Language Arts
Social Studies 10 Social Studies
P.E. 14 P.E.
Art 6 Art
Circle Graph Practice 1
Hours a Day 5 Different Teenagers Watch TV
Teenager Hours of TV Watched Per % of the day
Day (24 Hours)
Steve 4
Heather 7
Chad 2
Maria 8
Wendy 1
Hours a Day Teenagers Watch TV
Circle Graph Practice 2
Favorite Sport
Sport Number of People Voted %
Football 15
Basketball 21
Hockey 16
Volleyball 14
Soccer 28
Track & Field 11
Favorite Sport
Circle Graph Practice 3
Various Animals in an Ecosystem
Animal Number of Animals % of Ecosystem
Emperor Penguin 52
Sea Leopard 30
Fish 213
Skua Bird 25
Orca Whale 10
Shrimp 348
Animals That Make Up An Ecosystem
Circle Graph Practice 4
Gum Ball Flavors in a Gum Ball Dispenser
Flavor Number of Gum Balls % of Flavors
Strawberry 234
Lemon 312
Blueberry 276
Green Apple 189
Grape 390
Orange 156
Gum Ball Flavors in a Gum Ball Dispenser
Circle Graph
Percentages & Circle Graphs
Important Things to Remember - Answer Key
Calculating Percentages:
Step One: Add all data numbers together to calculate the whole total.
Example:
Ice Cream Votes For Favorite
Ice Cream
Chocolate 12
Vanilla 15
Add these numbers
together.
Strawberry 8
Cookie Dough 17 Total = 63
Swirl 11
Step Two: Divide EACH data number by your total. Round the decimal to the
nearest HUNDREDTH.
Step Three: Move the decimal over TWICE & you have your percentage!
Example:
Ice Cream Equation Equals
(Nearest Hundredth)
Chocolate 12/63 0.19 = 19%
Vanilla 15/63 0.24 = 24%
Strawberry 8/63 0.13 = 13%
Cookie Dough 17/63 0.27 = 27%
Swirl 11/63 0.17 = 17%
Step Four: CHECK YOUR WORK! Add all of your percentages together. You
should get 100%!
Important Note: Because you rounded, you MAY have a 1% margin of error.
This means you could get 99% or 101% & still be okay!
Creating Circle Graphs
Step One: Use a PENCIL to divide your circle into 4 equal parts. This gives
you four 25% sections. This is a great guide to get you started.
After splitting it into
quarters, you can
12.5% now split it down
25%
even farther!
12.5%
25% 25%
Step Two: Choose the percentage that seems to be graphed the easiest. In
our ice cream example, 24% seems to be the easiest to graph, but you
could chose whichever is easiest for you!
24% This leaves 1%
remaining in this
small section.
Step Three: Continue to use the guides you have created to graph each
percentage in your data set. Here are the steps from the ice cream
example:
24%
26%
This leaves 24%
remaining in this
section.
This leaves 12%
remaining in this
section. 13%
Continue around the circle 17%
17%
24% using your guides to graph 24%
the pie pieces the best you 19%
19%
can until you have the most 26%
26% accurate graph as possible! 13%
13%
Step Four: Check & finalize your graph. Be sure your pie pieces look
correct. For example, if the 26% piece looks smaller than the 19% piece, you
must have done something wrong. When it looks good, color each pie
piece or provide a key so you know which pie piece represents which data.
