Canadian Mathematical Olympiad & Junior Olympiad (CMO/CJMO)


The Canadian Mathematical Olympiad (CMO) is Canada’s premier national advanced mathematics competition.

Competitors require an invitation from the Canadian Mathematical Society in order to participate.

The Canadian Junior Mathematical Olympiad (CJMO), also by invitation only, is held at the same time for students up to grade ten.  The CJMO is not as challenging as the CMO, however some problems may appear in both competitions.

These 3-hour competitions are held each March at a selected time and date.  All official participants write at the same time and are proctored by their local school faculty or staff.

The top students at the CMO can readily expect great scholarship and recruitment offers from universities. They will also be short-listed for the selection for Team Canada at the International Mathematical Olympiad!

CMO Trophy

2023 Olympiads

Status Update:

The official competitors have now completed writing the Olympiads. Unofficial competitors have until March 13th to complete them. The CMO/CJMO Marking Team have begun the marking process. 

Detailed results will be emailed to the competitors once all the marking is complete. This web page will also be updated to reflect the award winners at that time. We expect the results to be ready by the end of the month.

Status Update:

The competition has now completed for 2023.  Marking is currently in progress.

When marking is finished, detailed results will be emailed to the competitors. This web page will also be updated to list the award winners. 

The official Problem Sets (Questions) are now available here:  CMO | CJMO 

2023 Status:

We have now sent instructions to all students and all proctors by email. Contact us if you did not receive the email and include your (or your student’s) Competitor ID code. Please check your Spam Folder/Junk Mail before contacting us.

Reminder: Proctors will not receive the Problem Set (questions) until 11:45 am EST on March 9th.

The CMO and CJMO will take place on Thursday, March 9th starting at 12 PM EST (noon) () and ending three hours later.  Those in other time zones must ensure they are writing simultaneously with this time slot (so all competitors write together regardless of location).

Competitors and proctors may want to review the process for participation.

Most invitations have been sent out now by email.  We ask all invitees and their proctors to register by Feb 27th. If you were told you are invited to the CMO or CJMO and have not received your invitation and registration form information, check your spam folder.  You can also email us with your name, school name, location and email address so that we can check our records and confirm for you.

How to Earn an Invitation

All students require an invitation from the Canadian Mathematical Society in order to participate.  Typically 75-100 students are invited each year to write the CMO and a further 20 students are invited to write the CJMO.

Invitations are normally sent out in February.

COMC – Canadian Open Mathematical Challenge

The primary way students to come to our attention to be considered for a CMO/CJMO invitation is by doing very well on the Canadian Open Mathematics Challenge (COMC) in October.  We normally invite the top fifty (approx) qualifying COMC students to write the CMO.

CMO Qualifying Repêchage

The next 75 (approx) top qualifying COMC students are invited to write the Repêchage.  This is a “take home” week-long exercise held in February.  Up to twenty students are selected from this group to write the CMO.

CJMO Invitations

After the Repêchage is complete, we select students for the CJMO.  Anyone invited to the CMO is not invited to the CJMO. Remaining Repêchage writers who are in grade ten or less are invited to write the CJMO (normally the maximum is twenty such students).  If additional spots are available, then the best qualifying COMC students in grade ten or less, who didn’t get invited to the CMO or Repêchage, are invited.

Alternate Competitions

By traditional arrangement, the top winners from the Alberta High School Mathematics Competition (Part II) and from le Concours de l’Association Mathématique du Québec (AMQ – secondaire) are invited to write the CMO.

Students we’ve invited to represent Canada at the European Girls’ Mathematical Olympiad (EGMO) or the Asia Pacific Mathematical Olympiad (APMO) are normally also invited.

Preparing for the Olympiads

It is important to emphasize that any student who is invited to write the Olympiads 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.  The most important resource are the publicly-available Problem Sets and Solutions from previous years.


In order to be an official participant, all competitors:

  • must be a Canadian Citizen or Permanent Resident of Canada (but not necessarily residing in Canada currently),
  • must not have formally enrolled at a university or any other equivalent post-secondary institution and must not yet have graduated from high school (or equivalent),
  • must be currently attending school full-time since the start of the current school year,
  • must be less than 20 years old as of June 30 of the year of the Competition, and
  • must not have written the Putnam Competition as an official participant.

Additionally, the CJMO requires that competitors must be in grade ten or earlier.

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

CMO 2022

CMO 2022 Champion: Zixiang Zhou
Congratulations to  Zixiang Zhou who attends London Central Secondary in London, Ontario!
Zixiang has earned this year’s CMO Cup and the top prize of $2,000 cash!
Rank Name School
Gold Medal Zixiang Zhou London Central Secondary (London, ON)
Silver Medal Warren Bei Homeschool (Vancouver, BC)
Bronze Medal Alec Le Helloco Lycée Blaise Pascal (Orsay, France)
Honourable Mention Cordelia Hu Farragut High (Knoxville, TN, USA)
Evan Lu Vincent Massey Secondary (Windsor, ON)
Kevin Min Cupertino High (Cupertino, CA, USA)
Kaixin Wang Magee Secondary (Vancouver, BC)
Jason Zhang Canton High (Canton, MI, USA)


  • Top score: 35/35
  • Lowest score for the top quartile: 12/35
  • Median score: 8/35
  • Competitors: 88 (78 official, 10 unofficial)

Matthew Brennan Award for Best CMO Solution

[read here for general information about the award]

The 2022 Award goes to Marvin Mao of Bergen County Academies (Hackensack, NJ, USA) for his solution to problem 3.

Problem 3 asked students to prove an upper and lower bound involving a game, and Marvin had a clever solution to the upper bound. He changed the rules to make the game easier to analyze, and showed that the new game still satisfies the desired upper bound. The idea to change the game was present in a few papers, but Marvin’s version was the most elegant.

Congratulations, Marvin!

CJMO 2022

CJMO 2022 Champion: Christopher Li
Congratulations to Christopher Li who attends TTmath School and William Berczy Public School in Markham, Ontario!
Rank Name School
Gold Medal Christopher Li TTmath School and William Berczy Public School (Markham, ON)
Honourable Mention Emily Ma Mark Garneau CI (Toronto, ON)
Joshua Wang Brookfield Central High (Brookfield, WI, USA)
Carol Wu Port Moody Secondary (Port Moody, BC)
Daniel Ye William Lyon MacKenzie CI (Toronto, ON)


  • Top score: 26/35
  • Lowest score for the top quartile: 18/35
  • Median score: 15/35
  • Competitors: 22

Earlier Olympiads

Older CMO Problem Sets and Solutions

Prizes and Awards

CMO Trophy

Official competitors compete for the right to be named the CMO Champion (or CJMO Champion).   We also recognize the Silver, Bronze and Honourable Mention competitors as appropriate each year.  Typically, this is at least six students for CMO and fewer for CJMO.

The CMO Championship Cup is a full-size trophy that permanently commemorates the Champions.  There is no equivalent for the CJMO.  The Cup is normally loaned to the CMO Champion’s school to display for a year

Prize Money

Each year a pre-budgeted amount is allocated from the Canadian Mathematical Society and its members and sponsors.  Normally, this prize pool is divided up to ensure the CMO Gold medalist gets CAD$2000 (unless there are ties) and Silver, Bronze, and Honourable Mentions also get prize money in decreasing amounts per person.

The CJMO is similar but with considerably smaller cash prizes.

Matthew Brennan Award for Best CMO Solution

In 2021 the CMS and the mathematical community lost one of our most valuable members.  Matthew represented Canada twice at the International Mathematical Olympiad, earning a bronze medal in 2011 and a gold medal in 2012. He returned to the IMO as deputy leader observer in 2014 and 2017, and was the leader in 2019. Matt was passionate about Olympiad math, and had served on the Canadian Mathematical Olympiad committee since 2014. He also contributed extensively to problem creation and selection.

In Matthew’s honour, the CMS has created the Matthew Brennan Award for Best CMO Solution. It is awarded every year to the student(s) who have written the best solution to a single problem on that year’s CMO. Their solution will be included in the official solutions, and they will receive a monetary prize.