## Columbia Engineering MMATHS Rules

*Last Updated: February 2, 2015*

**General Rules**

- Contestants must be 19 years old or younger and must not be enrolled full-time at a university.
- Each team can have no more than six people. Teams with fewer than six people will be at a disadvantage. For the team round, teams with fewer than four people will be combined, but these teams' scores will not count.
- No aids other than writing instruments and paper will be allowed. In particular, no calculators will be allowed on any part of the competition, and any cell phones must be given to a coach or a proctor before the contest round begins.
- Columbia Engineering MMATHS will use the ARML mathematical conventions. Please make sure students are familiar with these conventions so that their answers are not marked wrong because they did not write their answers in simplest form.

**Specific Rules**

Note: The rules for specific rounds are subject to change.

*Mathathon Round*

The mathathon round will last for 90 minutes. Teammates will work together to solve small packets of questions. When a team submits its final answers to one packet, the team may move onto the next packet. The point values for each question increase, as does the difficulty, with each subsequent packet. A team may spend as much time as it likes on any one packet, but the team will only have 90 minutes to get through as many packets as it can.

- Note: This round is similar to HMMT's Guts round.

*Individual Round*

The individual round will last for 78 minutes. The test will have thirteen questions. All of the questions are weighted equally and can have numerical answers only.

*Mixer Round*

In the mixer round, students will be randomly grouped with students from other teams. Each of the newly formed teams will have 90 minutes to work on a variety of challenging questions. The individuals in the tiebreaker round will arrive late to this event, and they will be split into teams and have to catch up with everyone else.. This round will not count towards the students' or teams' scores, but there may be a separate small prize for the winning team of the mixer round. The exact format of the mixer round will be revealed on the day of the contest.

*Tiebreaker Round*

The individual tiebreaker round will be a proof-based test.

**Scoring**

*Individual Score*

An individual's score will be his or her score in the individual round. If ties must be broken to determine the ranks of the top students, the tiebreaker round will be used.

*Team Score*

A team's score will be the sum of its mathathon round score and the individual round scores of its members. The rounds are weighted so that the sum of the individual round scores is worth as much as the team round score. If two teams are tied, the following criteria will be used, in order, until a winner can be determined:

- Highest mathathon round score.
- The highest-numbered question on the short answer part of the mathathon round answered correctly by one tied team but incorrectly by another.