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All the sessions below are free and open to the public, but we do take donations!
Introductory Problem Solving Workshop
Presented by: Joyce Gong and Aaron Cushman
New to math competitions and problem solving? Join our free relaxed problem solving workshop based on AMC 8 and MATHCOUNTS material. Suitable for middle school students. Enjoy pizza after the end of the class.
If this problem set is too hard, then you are not ready yet.
If this problem set is too easy, then consider our other classes.
Location: Brownson Hall BR-72, Manhattanville University
Time: Tuesdays, 5-5:50 pm
Feb 3 - 2026 AMC 8 Review
Feb 10 - Quadratics
Feb 17 - NO SESSION (winter break)
Feb 24 - Vieta's formula
March 3
March 10
March 17
March 24
March 31 - NO SESSION (spring break)
April 7
Recreational Math Seminar
Our main event, open to all levels. Presenters and topics vary from week to week.
Location: Brownson Hall BR-72, Manhattanville University
Time: Tuesdays 6-7:30 pm
Feb 3
Title: Representing fractions as sums of reciprocals in binary number systems
Speaker: Dr. Peder Olsen
Abstract: Palindromic pandemonium focusing on palindromes in number systems with only 0 and 1. The question is if we can find a number system using only the digits 0 and 1 such that every fraction can be written as a sum of reciprocal palindromes in that number system. I encourage everyone to try before we meet. This the session will be interactive, so even a failure to succeed will be worth it. Be prepared to add fractions and solve quadratic equations. We discussed related questions in the prior two years; if anyone wants to see what happened the last two years, the last talks are available here: https://github.com/pederao/palindrome/tree/main/talks/wamc and even more information is available here:
https://github.com/pederao/palindrome/tree/main.
For those that understand python you can even play around with some of the code. This talk doesn't require you to have attended the past lectures and is open to all.
Feb 10
Title: A Remarkable Triangle
Speaker: Dr. Roman Muchnik
Abstract: We will discuss a number of different solutions for the 80-80-20 triangle problem
Let ABC be an isosceles triangle (AB = AC) with ∠BAC = 20°. Point D is on side AC such that ∠CBD = 50°. Point E is on side AB such that ∠BCE = 60°. Find the measure of ∠CED.
Bio: Dr. Muchnik is active in recreational mathematics groups such as Math-M-Addicts. He is currently works for Nomura Securities. Previously, he was an assistant professor at University of Chicago, received a PhD in Mathematics from Yale and a BS in Mathematics from CalTech.
Feb 24
Title: The Games of Nim, Chomp and some of their Friends
Speaker: Dr. Jon Lenchner
Abstract: In this talk, I will tell you about so-called two-person, sequential, impartial, perfect information games, the prime example of which is the game of Nim. I will describe how to play perfect Nim, and explain how the idea behind perfect Nim-play is the key to understanding perfect play in all other two-person, sequential, impartial, perfect information games. We will then also discuss the games of Chomp, Kayles and a 2D version of Nim that I have devised called Nimbly.
Bio: Dr. Jon Lenchner is a Senior Technical Staff Member at the IBM T.J. Watson Research Center in Yorktown Heights, NY. Previously he was the Chief Scientist of the IBM Research Africa labs in Kenya and South Africa. He has developed robots to help with data center energy efficiency and for greeting visitors at the IBM lab. He has also worked on highly instrumented, smart spaces and smart conference rooms, including a highly instrumented "war room" to help the professional basketball team, the Toronto Raptors, with trades and draft picks.
March 3
March 10
March 17
March 24
April 7
Intermediate Problem Solving Workshop
Presented by Chen Lei and Joseph Girotto,
Interested in improving your AMC 10/12 score? Join us for a free topic-based workshop covering algebra, geometry, combinatorics, and number theory. Our spring workshop will concentrate on AMC 10/12 level problems.
Zoom: https://us06web.zoom.us/j/87914723806?pwd=dHBkNDNWOHBpdmdkT2xLbFBWTDZJUT09
Thursdays, 6-6:50 PM, Online
Feb 26: AIME 2025 Review
Mar 5: Quadratics, Polynomials, Vieta’s
Mar 12: Algebraic Manipulations and Factorizations
Mar 19: Euclidean Geometry
Mar 26: Probability & Combinatorics I
Apr 9: Probability & Combinatorics II
Apr 16: Number Theory: Factors, Divisors, and Bases
Apr 23: Number Theory: Diophantine Equations, Modular Arithmetic
Advanced Problem Solving Workshop
Presented by: Ethan Shi, Henry Xue, and Srihaan Seelam
Comfortable with the majority of AMC 10/12 problems? Interested in team competitions? Come and train with us for more advanced team contests. We will use past GiM, CMIMC, Purple Comet, and ARML problems
Location: Brownson Hall BR-101, Manhattanville College
Time: Sundays, 3:00-4:30 pm
Jan 18 - BrUMO
Jan 25 - BrUMO
Feb 1 - GiM
Feb 8 - BrUMO
Feb 15 - BrUMO
Feb 22 - BrUMO
Mar 1 - CMIMC
Mar 8 - CMIMC
Mar 15 - CMIMC
Mar 22 - Purple Comet
Mar 29 - Purple Comet
Apr 5 - Purple Comet
Apr 12 - Purple Comet
Apr 19 - NO SESSION
Apr 26 - ARML
May 3 - ARML
May 10 - ARML
May 17 - ARML
Math Contests
Math Contests
Upcoming competitions:
PUMAC (high school)
Nov 22 2025 at Princeton, NJ
LMT (middle school)
Dec 13, 2025 at Lexington High School, MA
AMC 8
January 25, 2026, 1:30-2:30 PM
AIME, qualified students only
February 5, 2026
BrUMO Division A & B
February 28, 2026 at Brown University
GiM
February 28, 2026 at Yale University
Math Kangaroo (K-12)
March 19, 2026 at Manhattanville University
CMIMC
March 28, 2026 at CMU
Signup is not open
GAIM Elementary School, Girls grade 3-5
April 18, 2026 at Manhattanville University
Signup will open in February
GAIM Middle School, Girls grade 6-8
April 18, 2026 at Manhattanville University
Signup will open in February
Purple Comet Middle School
April 19, 2026 at Manhattanville University
Signup will open in February
Purple Comet High School
April 19, 2026 at Manhattanville University
Signup will open in February
LMT Spring (middle school)
May 2026 at Lexington High School, MA
Signup not open yet
ARML (Westchester Students Only)
May/June 2026 at at St. Alsem
Signup not open yet
Other Contests?
If you think there are other contests we should be hosting or sending teams to, please let us know.
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