Identifying Prime Numbers
Lesson plan = 60 min activity
This has been developed for use on Sumdog (www.sumdog.com), a new
website offering high-quality, free mathematics games for students aged
9-13.
Classroom
resources
Objective
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Review prime numbers less than 100 and develop ways to identify them
Structure
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60 min lesson
Online activity followed by offline classroom activity
Resources
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Access to the Sumdog website
Student handout from our website
(http://www.sumdog.com/en/Prime_Numbers_Review/attachments/PrimeNumbers_
Handout.doc)
Plan
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Preparation (optional):
◦ Sign up for an account on Sumdog and create accounts for your students.
Activity (60 min):
◦ Quickly review prime numbers (5 min)
◦ Play Sumdog games (15 min)
▪ Pass out the student handouts. These will explain how to use the website.
▪ Have the students start playing any game, choosing Level 9 (“Identifying
prime numbers less than 100”).
▪ Ask the students to think about how they identify primes and figure out what
their strategy is. They should write this down on their handout.
◦ Discussion (15 min)
▪ Ask students to share their strategies. Choose a student to write these up on
the board.
▪ Discuss why these work and suggest more that they have not thought of.
◦ Play Sumdog games (15 min)
▪ Students should continue playing, trying out a new strategy that they have not
used before. Ask them to evaluate how successful it is.
◦ Discussion (10 min)
▪ Discuss with students which strategies they thought were the most successful
and then rank them on the board using stars.
Additional Resources
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Get additional resources to help you with this lesson at:
http://www.sumdog.com/en/Classroom_Resources/
Play Sumdog’s free mathematics games at http://www.sumdog.com/
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