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04/05/2025

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Centennial and Glenelg Math Tournament

Registration is free and open until April 2, 2025, 11:59 PM.

-> 01.

Overview

What is DECAGON?

The Centennial National Math Honor Society is partnering this year with the Glenelg National Math Honor Society to host the new DECAGON Tournament, a continuation of the annual CHS Mu Alpha Theta Tournament! All levels of math competition experience are welcome.

The tournament is a great way for competitors to test their math skills in a fun, low-stress competition.

Students of all grades may register for free. If you plan to form a team with people you already know, please list the members of your team. If you register as an individual, we will place you on a team for the team round, so don’t worry!

Location

We will be hosting at two locations:

Lunch

Lunch is free at both locations! We will be serving cheese and pepperoni pizza.

Test Guidelines

All answers should be in simplest form. The only permitted materials are pencils and paper. Computational aids, including but not limited to calculators, rulers, protractors, and graph paper are strictly prohibited.

Past Problems

Check out some of our rounds from previous years to get used to the format and difficulty!

Individual Round

Competitors will pick 2 of the following categories to compete in:

  • General
  • Algebra/Number Theory
  • Geometry
  • Probability/Combinatorics

Each test will be 15 questions long. Competitors will have 50 minutes to complete each test.

Team Round

Teams of up to 4 will take the team test. Competitors may form prearranged teams. Those without teammates will be put in a team. The test will be 10 questions and 30 minutes long. The team score will be calculated by adding twice the team round score to four times the average score on all tests of all members (as some teams have fewer than 4 people).

Countdown Round

The top 4 competitors from each individual category will participate in a countdown round for that category. Competitors will compete head-to-head in this round. A problem will be displayed through a presentation, and the contestants will race to solve the problem (with pencil and paper).

Theme Round

The theme round is a more fun and casual round, and this year's theme will be revealed at the event.

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Prizes

Over $1000 in prizes!

01.

Trophies!

02.

Medals!

03.

Plaques!

04.

And More!

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Schedule

TimeEvent
8:30 AM - 9:00 AMCheck-in
9:00 AM - 9:20 AMOpening Ceremony
9:25 AM - 10:20 AMIndividual Round 1
10:25 AM - 11:20 AMIndividual Round 2
11:25 AM - 12:00 PMTeam Round
12:05 PM - 12:50 PMLunch
12:55 PM - 1:30 PMTheme Round
1:35 PM - 2:10 PMCountdown Round
2:15 PM - 2:40 PMAwards

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Sponsors

Sponsors

Jane Street LogoArt of Problem Solving LogoHudson River Trading LogoWegmans LogoiD Tech LogoBBMC Math LogoFive Rings LogoMathworks LogoPyoneers Logo

Interested in sponsoring us? Take a look at our prospectus and email us at decagontournament@gmail.com!

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Photos

2025

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Our Team

Centennial Organizers

  • -> Albert Cao
  • -> Tanvi Gupta
  • -> Martin Meister
  • -> Jaden Li
  • -> Sophie Zhang
  • -> Barry Chen
  • -> Nicholas Cui
  • -> Aryan Sharma
  • -> Joshua Oh
  • -> Ethan Burgoon
  • -> Nathan Lu
  • -> Joe Li

Glenelg Organizers

  • -> Samuel Yoon
  • -> Sai Challagundla
  • -> Zenia Haroon
  • -> Riya Gangabathina
  • -> Sanjay Mavalli
  • -> Alex Chen
  • -> Steven Wang
  • -> Jeffrey Wu

DECAGONTournament

Questions? Contact us!

Website built by Ramy Kaddouri. Source available on GitHub.