Ratio and
Probability
Performance Task Objectives
 Find the probability of
an event or of two independent events.
Sunshine State Standards
Materials
 Student recording sheet
 Paper clips
 Pencil
 Rulers
Student arrangement
Individual or small group
Task
Present the problem on the student Recording Sheet to your students.
Performance Criteria
 Does one of the spinners
show equally likely outcomes for AD?
 Is one of the spinners divided
and numbered so that the probability of spinning an even number is two
times as great as the probability of spinning an odd number?
 Can the student clearly
explain how the two spinners meet the criteria in the problem?
Directions:
Design two spinners.
One spinner should be designed to show equally likely outcomes
for the letters AD.
The second spinner should be designed so that the probability of spinning
an even number is twice as likely as spinning an odd number. You may use
any of the digits 1 through 9 on your spinner. A number may be used
more than once.
How will you design each spinner?
Use the following directions
to test your spinners.
Spinner directions.
1. Place the paper clip over the center of your spinner.
2. Place the pencil point on the center point of your spinner, through
the paper clip.
3. Using the other hand, spin the paper clip around the pencil point.
Explain how the first spinner shows equally likely outcomes and how the
second spinner shows that spinning an even number is two times as likely
as spinning an odd number.
