Canadian Mathematical Society

Canadian Mathematical Olympiad

Supported by the Actuarial Profession
Casualty Actuarial Society
Society of Actuaries

The Canadian Mathematical Olympiad (CMO) is Canada's premier national advanced mathematics competition. Candidates require an invitation from the Canadian Mathematical Society in order to participate.

The CMS wishes to thank the sponsors and partners who make our competitions program successful.

CMO 2020

The 2020 Canadian Mathematical Olympiad (CMO) will be held on March 12, 2020.

The CMO is a three hour competition, to start at 9AM local time in provinces west of Ontario (or if you are in Central, Mountain or Pacific Time Zone) or at 1PM local time in Ontario or provinces east of that (or if you are in Eastern or Atlantic Time Zone).

NEW FOR 2020: Canadian Junior Mathematical Olympiad (CJMO) ⇒ The CJMO is an olympiad style competition for younger students. Like for the CMO, the invitation to the CJMO is based on the results of the COMC and the Repêchage. Invitees will be the top students in grade 10 and below. Invitations to the CJMO will be sent out after the Repêchage has been graded. The CJMO exam will be written at the same time as the CMO - on Thursday, March 12, 2020.

CMO 2019
Official Results:

William Zhao
CMO Champion

Congratulations to CMO Champion William Zhao who attends Richmond Hill High School in Richmond Hill!

William has earned this year's Canadian Mathematical Olympiad Cup and $2,000 cash!

Canadian Division
Place Competitor(s) Prize
1st William Zhao, Richmond Hill High School, Richmond Hill, ON $ 2000 and the CMO Cup
2nd Victor Rong, Marc Garneau C. I., Toronto, ON $ 1500 prize
3rd Howard Halim, University of Toronto Schools, Toronto, ON $ 1000 prize
(listed alphabetically)
Michael Li, Marc Garneau C. I., Toronto, ON;
Zhening Li, Sir John A. Macdonald S.S., Waterloo, ON;
Eric Shen, University of Toronto Schools, Toronto, ON;
Edgar Wang, Marianopolis College, Westmount, QC;
Scott Xu, Hon. Vincent Massey S.S., Windsor, ON;
$ 500 each
International Division
Top Competitors
(listed alphabetically)
Thomas Guo (Phillips Exeter Academy, Exeter, NH)
Sebastien Jeon (Bergen County Academies, Hackensack, NJ)
Freddie Zhao (ICAE, Troy, MI)
  • Download and try the 2019 questions.
  • View the official solutions.
  • Read our press release
  • The top score this year was 34/35, the median score was 12.5/35.
  • A total of 86 students from more than 50 different schools wrote the 2019 CMO.
  • Competitors can look up their own scores by giving their (6-digit) ID number here:


Candidates require an invitation from the Canadian Mathematical Society in order to participate:

  1. The Canadian Open Mathematics Challenge (COMC) is the main qualifier for the CMO. Normally, the top 50 qualifying students from the COMC receive a direct invitation to write the CMO.
  2. Approximately the top 15-20 competitors from the CMO Qualifying Repêchage (CMOQR) earn invitations to the CMO.
  3. Normally, the top 3 students from the Alberta High School Mathematics Competition (Part II) and le Concours de l'Association Mathématique du Québec are invited to write the CMO.


In order to be eligible to write the CMO and receive prizes, the student:

  • must be a Canadian citizen or permanent resident of Canada who is in full-time attendance at an elementary or secondary school, or CEGEP since September of the year prior to the CMO;
  • be less than 20 years old as of June 30 of the year of the CMO; and
  • must not have written the Putnam Competition.

Students who choose to write the CMO agree to allow the CMS to publish their names and schools when announcing contest results.

Results and Prizes

Official results are posted in two divisions: (1) students competing within Canada (the Canadian division) and (2) students competing abroad (the International division). Actual scores are not displayed publicly but students will be informed of their own scores.

The Championship title, the Cup and the prize money are only awarded to students in the Canadian division.

Prizes (Canadian division only): If there are no ties, the First Prize winner in the Canadian Mathematical Olympiad receives the CMO Cup and $2000. In addition, the Second Prize winner receives $1500, the Third Prize winner receives $1000 and students earning an Honourable Mention (up to six students) receive $500 each. In the case of ties, prizes are pooled upwards.

Preparing for the CMO

It is important to emphasize that any student who is invited to write the CMO should be aware that success will require mathematics at a higher level than is taught in most schools, and therefore should prepare specifically for the competition. The CMS has several resources available for competitors.

Past Competitions

The CMO Hall of Fame
The following pages list the CMO winners from past competitions sorted

Exam Archive

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