数学竞赛里还有一种TEAM 的竞赛，孩子们都非常喜欢，不仅有意思，更有挑战。参加竞赛即交到志趣相投的朋友， 更培养了团队合作精神。

下面就介绍几个非常Popular的team竞赛:

1. Waterloo 大学举办的Canadian Team Mathematics Contest               

这个竞赛为高中生设计，每队6名选手可以是任何年级的，由学校组队参赛。近几年来这个竞赛越来越受欢迎，因为在加拿大基本没有其他的team的数学竞赛。

Format：

• team questions, where team members may collaborate (45 Min)
• individual problems (45 min)
• math relays — one student's answer to a question is needed by a teammate to solve the next question (45 min)

详情请参见以下网站：

http://www.cemc.uwaterloo.ca/contests/ctmc.html

2.ARML: American Regions Mathematics League
ARML 是美国最大最有影响力的team 数学竞赛， 2014年150 多个队2000多名学生参加了这个比赛。每个队由15个选手组成，要参与如下项目：

• A team round, where the entire team has 20 minutes to solve 10 problems.
• A power question, where the entire team has one hour to solve a multiple-part (usually ten) question requiring explanations and proofs.
• An individual round, where each team member answers five groups of two questions each, with ten minutes per pair.
• A relay, where the team is broken into five groups of three. Within each group, the first team member solves a problem and passes the solution to the next team member, who plugs that answer into their question, and so on.

In recent years, there has been a super relay, where two groups of seven team members (fourteen in all) both work to give a correct answer to the fifteenth team member. That last team member substitutes two answers into his problem. For logistical reasons, the Super Relay has never counted towards the team score. It was instituted as a "filler" while scores are tabulated. Candies and other goodies are sometimes rewards for the super relay round.

Also in recent years, a song contest has become an informal event at ARML. Each school is allowed to have any number of their students perform a song related to mathematics, usually a parody of a popular song, with its lyrics replaced.

多伦多大学sponsor的Math Circle 每年都会组织多伦多地区的中学生数学爱好者参加这个竞赛，详情请参见：

http://www.arml2.com/arml_2016/page/index.php?page_type=public&page=home

http://www.torontomathcircles.ca/home.html

3. HMMT: Harvard-MIT Math Tournament

这是由Harvard和MIT学生联合组织的中学生数学竞赛。它始于1998年，每年二月和十一月各办一次，在两校之间交替进行。这个比赛在数学娃中也非常受欢迎，它每个队由6-8名队员组成，要参与如下项目：

Individual Round

The Individual Round consists of three subject tests in Algebra, Geometry, and Combinatorics. Each subject test consists of 10 questions and is 50 minutes in length.

Team Round

In the Team Round, a team competes together on a 60 minute test. The problems are weighted according to difficulty, adding up together to 400 points. The round is targeted at teams comfortable writing rigorous proofs.

Guts Round

The Guts Round is an 80 minute team event with 36 short answer questions on an assortment of subjects, of varying difficulty and point values. Each team is seated in a predetermined spot, and the questions are divided into groups of four. At the starting signal, each team sends a runner to an assigned problem station to pick up copies of the first set of four problems for each team member. As soon as a team has answers for one problem set, the runner may bring the answers to the problem station and pick up the next set. It is not expected that students will finish all the problems. Grading is immediate and scores are posted in real time, resulting in an exciting atmosphere for the competitors. The Guts round is worth a total of approximately 400 points.

有关竞赛详情请参见以下网站：

https://www.hmmt.co/

此外，Princeton，Stanford 等大学也有类似的大学生run 的team 竞赛。

更多详情请参见它们的网站：

https://pumac.princeton.edu/

https://sumo.stanford.edu/smt/