OMO Contest Information

The Fall 2016 Contest will be held from November 4 - 15, 2016.
The Spring 2017 Contest will be held from March 24 - April 4, 2017.

Contact

Please send any questions or suggestions to OnlineMathOpenTeam@gmail.com.

Registration Instructions

  1. Gather a team of up to four students. Students must not have graduated from high school. No student can be on more than one team.
  2. Designate a team leader, who will submit answers on behalf of his or her entire team. The team leader will need an account on the io.org site. Click here to register an io.org account if you don't already have one.
  3. The team leader will submit answers to the contest through his or her individual account on internetolympiad.org. Note that this is different from previous years!
  4. The team leader will also be asked to input a team name and the names of all the team members.

The contest can be found under Contests & Rules, alongside all the NIMO contests. Click the link labelled "Register/Update Team" to input the names of your team members.

The change from a team account to a single individual account saves students from having to create a new account each year, without the hassle of having each student create an individual account.

Note: when we say up to four students, we really do mean "up to"! Because the time limit is so long, partial teams are not significantly disadvantaged, and we welcome their participation.

Contest Format

  • The Fall and Spring contests consist of 30 problems each.
  • Each answer is a nonnegative integer not exceeding 232-1 = 4294967295.

During the testing windows, teams may work on the problems as much as they like. The problems are sorted roughly in order of difficulty and range from early AMC- to late IMO-level.

Team Guidelines

Students may compete in teams of up to four people, but no student can belong to more than one team. Participants must not have graduated from high school (or the equivalent secondary school institution in other countries). Only one member, namely the team leader, on each team needs an account. Please see the registration instructions for more information.

Each team will submit its final answers through its team account on the submission form. Since the current interface does not allow for much flexibility in communication between team members, we recommend using Google Docs and Spreadsheets to discuss problems and compare answers, especially if teammates cannot communicate in person. Teams may spend as much time as they like on the test before the deadline.

Teams need not remain the same between the Fall and Spring contests, and students are permitted to participate in whichever contests they like.

Rules

  1. Four-function calculators (calculators which can perform only the four basic arithmetic operations) are permitted on the Online Math Open. Any other computational aids, including scientific calculators, graphing calculators, or computer programs is prohibited. All problems on the Online Math Open are solvable without a calculator. Four-function calculators are permitted only to help participants reduce computation errors.
  2. Drawing aids such as graph paper, ruler, and compass are permitted. However, electronic drawing aids, such as Geogebra and graphing calculators, are not allowed. Print and electronic publications are also not allowed.
  3. Members of different teams cannot communicate with each other about the contest while the contest is running.
  4. Your score is the number of questions answered correctly; that is, every problem is worth one point. Ties will be broken based on the "hardest" problem that a team answered correctly. Remaining ties will be broken by the second hardest problem solved, and so on. (Problem m is harder than problem n if fewer teams solve problem m OR if the number of solves is equal and m > n.)
  5. Participation in the Online Math Open is free.

Clarifications and Results

Clarifications will be posted as they are answered. For the most recent contests, they will be posted here. If you have a question about problem wording, please email OnlineMathOpenTeam@gmail.com with "Clarification" in the subject. We have the right to deny clarification requests that we feel we cannot answer.

After the contest is over, we will release the answers to the problems within the next day. Please do not discuss the test until answers are released. If you have a protest about an answer, you may send an email to OnlineMathOpenTeam@gmail.com. (Include "Protest" in the subject). Results will be released in the following weeks.

Note: Results will be counted only for teams that submit answers at least once. Teams that only register an account will not be listed in the final rankings.