MathBase Open + Invitational
A free, two-stage competition for students who love ambitious problems—starting with a fast-paced Open and culminating in a proof-based Invitational where top finishers win MathBase merch.
Next competition
All times Eastern · online
2026
Edition
1:00 PM
MBO begins
60 minutes · strictly timed
4:00 PM
Qualifiers announced
Top 8 advance
5:00 PM
MBI begins
90-minute proof round
7:30 PM
Winners announced
Top finishers win merch
One competition, two stages
Start in the Open. Finish among the top eight, and you will earn an invitation to the proof-based final.
A brisk, wide-ranging round with original MathBase problems inspired by the creativity of AMC and AIME competition math.
40
multiple-choice problems
60 min
to complete the round
4 topics
algebra, geometry, number theory & probability
Top eight advance. Scoring and proctoring instructions are included with each contest set.
A focused final that rewards mathematical depth, creative reasoning, and clear proof-writing in number theory and algebra.
4
proof-based problems
90 min
to write complete solutions
Top 8
MBO scorers receive invitations
Write complete proofs. Invitations and submission instructions are emailed directly to qualifiers.
Prizes for top finishers
Standout competitors can take home exclusive MathBase merch and show off the work they put into every solution.
The next problem is yours
Registration is free. Sign up now to receive the August MathBase Open contest details.
Sign up for the MBOYou’ll be taken to a short Google Form.