The 2021 Canadian Open Mathematics Challenge — Oct 28/29


The Canadian Open Mathematics Challenge (COMC) is Canada's premier national mathematics competition open to any student with an interest in and grasp of high school math. The purpose of the COMC is to encourage students to explore, discover, and learn more about mathematics and problem solving. The competition serves to provide teachers with a unique student enrichment activity during the fall term.

Approximately 80 top-ranking students from the COMC and the Canadian Mathematical Olympiad Qualifying Repêchage (CMOQR) will be invited to write the Canadian Mathematical Olympiad (CMO). Based on the results from the COMC, the CMO and other national and international mathematics competitions and camps, the Canadian Mathematical Society IMO Committee will then select six students as part of Math Team Canada to travel to, and compete in, the International Mathematical Olympiad (IMO).

Top COMC female contestants will also qualify to be part of Girls’ Math Team Canada to represent Canada at the European Girls' Mathematical Olympiad (EGMO). EGMO is an international mathematics competition.

Depending on their grade level and performance, students participating in the COMC will also have the opportunity to be considered for university scholarships, get invited to math camps, garner awards, and win prizes.

Returning for 2021: Teacher Appreciation Prizes


The 2021 COMC will be held on Thursday, October 28th in Canada and the Americas (anywhere in North/South American time zones), and on Friday, October 29th elsewhere in the world.


Teachers can register their schools for the COMC by clicking the link below. Registration costs CAD$25.00 per student in Canada and USD$30 per student for international participants.

Don't postpone this!  The registration deadline for print exams is Monday, October 18th.
The registration deadline for Digital Delivery is Sunday, October 24th.

Problem of the Week!

During the weeks prior to the COMC competition, the CMS is happy to present our Problem of the Week (POTW). Please visit our POTW page.

Stay informed!

Subscribe to the free Canada Math Competitions e-mail list.

Provides announcements and information from the CMS related to the COMC, CMO, IMO, and other student math competitions.

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