Counting by 10 - 10 more, 10 less
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.
Classroom
resources
Objective
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Practice adding and subtracting 10 from multiples of 10
Structure
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60 min lesson
Online activity in pairs
Resources
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Access to the Sumdog website
Student worksheets
(http://www.sumdog.com/en/Count_By_Ten/attachments/CountByTen_Handout.pdf)
Optional: Interactive whiteboard or projector
Plan
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Preparation:
◦ Sign up for an account on Sumdog and upload your class (optional).
◦ Print out student handouts.
Activity (60 min):
◦ Quickly review counting by 10 (10 min)
◦ Play Sumdog games (40 minutes)
▪ Assign the students in pairs: each pair plays together. Pass out handouts.
▪ Have them start any game. (A game with no timed questions such as Canal
Clearup, Athletics, or Street Racer would be good for younger students.)
▪ Ask the students to select the first topic on the handout: Level 2 - "Adding 10
to multiples of 10"
▪ One partner plays for 10 minutes while the other student records any
questions they got wrong on their handout.
▪ Students switch and choose: Level 2 - "Subtracting 10 from multiples of 10"
▪ Students continue to play, taking turns so that each student gets a chance on
both of the topics.
◦ Review and discuss (10 minutes)
▪ At the end, students take a few minutes each to quiz each other on the
questions they got wrong.
▪ Class has a short discussion on what questions were the most challenging.
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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