An online, two-level maths olympiad that starts younger than almost any other — Nursery upward.
Not what you were looking for? Not the Canadian Mathematical Olympiad, which shares the CMO acronym and is a proof-based national olympiad run by the Canadian Mathematical Society. This is CREST Olympiads' online school competition.
Nursery to Grade 10. For Nursery to Class 1 the exam is parent/teacher assisted. source
The paper is split into Practical Mathematics and an Achiever's Section, and the two are marked differently — Achiever's questions are worth more. The size of the paper scales with the class: Nursery to Senior KG sit 25 questions for 30 marks in 45 minutes; Classes 1-4 sit 35 questions for 45 marks; Classes 5-10 sit 50 questions for 60 marks. In every band the Achiever's questions are the double-weighted ones, so they decide the ranking. source
We checked the CMO page, the marking-scheme page and the FAQs: the word 'negative' does not appear on any of them. So we cannot tell you whether CMO penalises a wrong answer, and we are not going to guess. Ask CREST before the exam if it matters to your child's strategy. Note that CREST's sibling Mental Maths Olympiad does state it has had no negative marking since 2025 — but that is a statement about CMMO, not about CMO.
The CMO page states two levels plainly and publishes Level 2 dates. CREST's FAQ page elsewhere says its olympiads 'primarily feature one level'. The CMO page is the more specific and more recently dated source, so we follow it.
Papers are copyright of the organiser, so we point you to the source rather than hosting copies.
Original CREST Champs papers modelled on this competition's published format — our own content, not the organiser's papers, with full answer keys and worked solutions included.
CREST does not say. The word does not appear on the CMO page, the marking scheme, or the FAQs, so we have left it blank rather than guess. If your child's strategy depends on it, ask CREST directly.
It depends on the class. Nursery to Senior KG sit 25 questions for 30 marks in 45 minutes. Classes 1-4 sit 35 questions for 45 marks in an hour. Classes 5-10 sit 50 questions for 60 marks in an hour. Every band includes an Achiever's Section whose questions are worth double.
No. That is also abbreviated CMO but is an entirely separate, proof-based national olympiad run by the Canadian Mathematical Society. This is CREST Olympiads' online school competition, based in India.