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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Today at 3:18 PM
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. There are middle and high school competition math camps as well as Math Beasts camps that review key topics coupled with fun explorations covering areas such as graph theory (Math Beasts Camp 6), cryptography (Math Beasts Camp 7-8), and topology (Math Beasts Camp 8-9)!

Be sure to mark your calendars for the following events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers[/list]
Our full course list for upcoming classes is below:
All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

Introductory: Grades 5-10

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0 replies
jlacosta
Today at 3:18 PM
0 replies
J
H
k a My Retirement & New Leadership at AoPS
rrusczyk   1571
N Mar 26, 2025 by SmartGroot
I write today to announce my retirement as CEO from Art of Problem Solving. When I founded AoPS 22 years ago, I never imagined that we would reach so many students and families, or that we would find so many channels through which we discover, inspire, and train the great problem solvers of the next generation. I am very proud of all we have accomplished and I’m thankful for the many supporters who provided inspiration and encouragement along the way. I'm particularly grateful to all of the wonderful members of the AoPS Community!

I’m delighted to introduce our new leaders - Ben Kornell and Andrew Sutherland. Ben has extensive experience in education and edtech prior to joining AoPS as my successor as CEO, including starting like I did as a classroom teacher. He has a deep understanding of the value of our work because he’s an AoPS parent! Meanwhile, Andrew and I have common roots as founders of education companies; he launched Quizlet at age 15! His journey from founder to MIT to technology and product leader as our Chief Product Officer traces a pathway many of our students will follow in the years to come.

Thank you again for your support for Art of Problem Solving and we look forward to working with millions more wonderful problem solvers in the years to come.

And special thanks to all of the amazing AoPS team members who have helped build AoPS. We’ve come a long way from here:IMAGE
1571 replies
rrusczyk
Mar 24, 2025
SmartGroot
Mar 26, 2025
J
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Moving P(o)in(t)s
bobthegod78   69
N 37 minutes ago by akliu
Source: USAJMO 2021/4
Carina has three pins, labeled $A, B$, and $C$, respectively, located at the origin of the coordinate plane. In a move, Carina may move a pin to an adjacent lattice point at distance $1$ away. What is the least number of moves that Carina can make in order for triangle $ABC$ to have area 2021?

(A lattice point is a point $(x, y)$ in the coordinate plane where $x$ and $y$ are both integers, not necessarily positive.)
69 replies
bobthegod78
Apr 15, 2021
akliu
37 minutes ago
J
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Double dose of cyanide on day 2
brianzjk   30
N an hour ago by akliu
Source: USAMO 2023/5
Let $n\geq3$ be an integer. We say that an arrangement of the numbers $1$, $2$, $\dots$, $n^2$ in a $n \times n$ table is row-valid if the numbers in each row can be permuted to form an arithmetic progression, and column-valid if the numbers in each column can be permuted to form an arithmetic progression. For what values of $n$ is it possible to transform any row-valid arrangement into a column-valid arrangement by permuting the numbers in each row?
30 replies
brianzjk
Mar 23, 2023
akliu
an hour ago
J
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Isosceles Triangulation
worthawholebean   70
N an hour ago by akliu
Source: USAMO 2008 Problem 4
Let $ \mathcal{P}$ be a convex polygon with $ n$ sides, $ n\ge3$. Any set of $ n - 3$ diagonals of $ \mathcal{P}$ that do not intersect in the interior of the polygon determine a triangulation of $ \mathcal{P}$ into $ n - 2$ triangles. If $ \mathcal{P}$ is regular and there is a triangulation of $ \mathcal{P}$ consisting of only isosceles triangles, find all the possible values of $ n$.
70 replies
worthawholebean
May 1, 2008
akliu
an hour ago
J
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Westford Academy to host Middle School Math Competition
cyou   5
N 2 hours ago by Inaaya
Hi AOPS community,

We are excited to announce that Westford Academy (located in Westford, MA) will be hosting its first ever math competition for middle school students (grades 5-8).

Based in Massachusetts, this tournament hosts ambitious and mathematically skilled students in grades 5–8 to compete against other middle school math teams while fostering their problem-solving skills and preparing them to continue enriching their STEM skills in high school and in the future.

This competition will be held on April 12, 2025 from 12:00 PM to 5:00 PM and will feature 3 rounds (team, speed, and accuracy). The problems will be of similar difficulty for AMC 8-10 and were written by USA(J)MO and AIME qualifiers.

If you are in the Massachusetts area and are curious about Mathematics, we cordially invite you to sign up by scanning the QR code on the attached flyer. Please note that teams consist of 4-6 competitors, but if you prefer to register as an individual competitor, you will be randomly placed on a team of other individual competitors. Feel free to refer the attached flyer and website as needed.


https://sites.google.com/westfordk12.us/wamt/home?authuser=2
5 replies
cyou
Mar 25, 2025
Inaaya
2 hours ago
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Correlation between USAMO and CMO qualification
rantaccountcs   3
N Mar 30, 2025 by BS2012
What is the correlation between cmo qualification and usamo qualification? What proportion of Canadian usamo qualifiers are cmo qualifiers and what proportion of cmo qualifiers are usamo qualifiers?
3 replies
rantaccountcs
Nov 2, 2023
BS2012
Mar 30, 2025
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Correlation between USAMO and CMO qualification
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rantaccountcs
156 posts
rantaccountcs
#1 h  Nov 2, 2023, 7:56 PM
Y by
What is the correlation between cmo qualification and usamo qualification? What proportion of Canadian usamo qualifiers are cmo qualifiers and what proportion of cmo qualifiers are usamo qualifiers?
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David_Kim_0202
383 posts
David_Kim_0202
#2 h  Nov 3, 2023, 3:47 AM
Y by
can usa people take canadian math competitions?
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mrtheory
2 posts
mrtheory
#3 h  Mar 30, 2025, 6:03 PM
Y by
David_Kim_0202 wrote:
can usa people take canadian math competitions?

yes
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BS2012
967 posts
BS2012
#4 h  Mar 30, 2025, 6:14 PM
Y by
mrtheory wrote:
David_Kim_0202 wrote:
can usa people take canadian math competitions?

yes

Really?
https://cms.math.ca/competitions/cmo/#CMOeligibility wrote:
In order to be an official participant, all competitors:

must be a Canadian Citizen or Permanent Resident of Canada (but not necessarily residing in Canada currently),

must not have formally enrolled at a university or any other equivalent post-secondary institution and must not yet have graduated from high school (or equivalent),

must be currently attending school full-time since the start of the current school year,

must be less than 20 years old as of June 30 of the year of the Competition.

Additionally, the CJMO requires that competitors must be in grade ten or earlier.
(https://cms.math.ca/competitions/cmo/#CMOeligibility)
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