co math circle logo
Home Calendar Join Afterschool ARML News FAQ Directions Donate Forms About Members

Interested in broadening your mathematical knowledge and sharpening your analytical thinking? Join the Colorado Math Circle for math talks and problem-solving sessions at the University of Colorado Boulder.

Calendar

View the 2025–26 meeting schedule.

Meetings will take place at CU Boulder except for afterschool meetings which will be held remotely.

Join

You may attend any meeting without pre-registering.

Submit this form to join our mailing list.

ARML Team

For high schoolers

Participate in the
ARML Competition

University of Nevada, Reno

Team tryouts held in Feb


2026 Colorado ARML Team

2026 Colorado ARML Team



Galois Group

For middle schoolers

Jan/Feb problem-solving sessions

Prepare for MATHCOUNTS, AMC 8

Participate in AMC 8

Euler Group

For high schoolers

Math talks and problem-solving sessions

Prepare for AMC 10/12, AIME, ARML

Participate in AMC 10/12 and team contests

Afterschool Program

For middle and high schoolers

Weekly online problem-solving sessions

See below for more information



Afterschool Program

The Colorado Math Circle will be offering weekly afterschool problem-solving sessions on Zoom every Thursday, 4:15-5:30 pm. These sessions are for advanced middle and high school students who wish to improve their mathematical problem-solving skills.

We expect to have two groups:

  • AMC: focusing on AMC 10/12 level problems
  • MathCounts: focusing on state level MathCounts problems

More …

Colorado ARML

In May 2026, the Colorado ARML Team will compete against regional teams from around the country and abroad at the ARML Competition. In 2025, twenty-nine Colorado students from ten different schools were chosen to represent the state in the team competition.

Over the years the Colorado team has won national honors in the B division six times, including first place in 2023, 2021, and 2006. Colorado students have ranked among the top ten individuals in six different years.

More …

News

June 2026
Thirty-one Colorado students from 11 different schools competed in the 2026 ARML Competition at the University of Nevada Reno. The national competition attracted 120+ fifteen-member teams and over 1800 students from the U.S. and abroad. Congratulations to Colorado ARML Team 1 which placed 8th out of 50 teams in the B Division!
April 2026
Congratulations to the following math circle members who qualified for the USA Mathematical Olympiad (USAMO) and USA Junior Mathematical Olympiad (USAJMO)!
2026 USAMO Shruti Arun Cherry Creek HS
 Joshua Liu Cherry Creek HS
 Derek Yin Fairview HS
   
2026 USAJMO Iris Li Stargate School
Special congratulations to Joshua Liu who received a USAMO Silver Award and an invitation to the Mathematical Olympiad Summer Program (MOP)!
April 2026
The 2026 ARML Local Competition attracted 300 six-member teams from around the country and abroad. The top Colorado team finished in 20th place among U.S. Teams! Congratulations to team members Joshua Liu, Neo Luo, Rohith Thomas, Alex Wang, Jonah Wang, and Derek Yin! Their Individual Round total was the 9th highest among U.S. teams.
April 2026
The Colorado Math Circle finished in 12th place in the 2025-2026 ARML Power Contest. Congratulations to everyone who participated this year!
December 2025
Congratulations to Shruti Arun of Cherry Creek HS who won a bronze medal in the 2025 Math Prize for Girls Olympiad!
October 2025
Congratulations to Shruti Arun of Cherry Creek HS who tied for 2nd highest score and placed fourth in the 2025 Math Prize for Girls competition! Each fall at MIT, about 250 young female mathematicians from the U.S. and Canada compete for cash prizes and the chance to qualify for the Math Prize Olympiad.

More …

FAQ

What are Colorado Math Circle meetings like?
They vary. Often a speaker will give a math talk on a specific topic. Past Euler Group topics have included generating functions, cyclotomic polynomials, dynamical systems, synchronization, graph theory, computability theory, knot theory, and olympiad inequalities. Past Galois Group topics have included parity, golden ratio, Pascal's triangle, Catalan numbers, recursion, and knot theory.

At most meetings we have time for group problem solving. The problems may require a numerical answer or may require a proof. (The word "proof" sounds intimidating but it just means you need to show that something is true.)

During problem solving sessions, students are free to collaborate with other students. We encourage students to present solutions at the board. This is an excellent way to practice explaining mathematics to others.

More …

Directions

Math circle meetings will take place on the CU-Boulder campus except for the weekly afterschool meetings which will be held remotely on Zoom. Campus locations include

About the Math Circle

The Colorado Math Circle was created in 2005 to provide extracurricular math opportunities for young math enthusiasts from around the state.

Directors

Silva Chang is a Teaching Professor in the Department of Applied Mathematics at CU Boulder. She founded the Colorado Math Circle and has directed it since 2005.

Thomas Davids is Co-Director of the Colorado Math Circle and Coach of the Colorado ARML Team. He grew up in Boulder, and is a Summit MS and Fairview HS alum. He currently works at Google.

More …

Members

The Members section contains meeting handouts and other resources. for the password.