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Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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k a March Highlights and 2025 AoPS Online Class Information
jlacosta   0
Mar 2, 2025
March is the month for State MATHCOUNTS competitions! Kudos to everyone who participated in their local chapter competitions and best of luck to all going to State! Join us on March 11th for a Math Jam devoted to our favorite Chapter competition problems! Are you interested in training for MATHCOUNTS? Be sure to check out our AMC 8/MATHCOUNTS Basics and Advanced courses.

Are you ready to level up with Olympiad training? Registration is open with early bird pricing available for our WOOT programs: MathWOOT (Levels 1 and 2), CodeWOOT, PhysicsWOOT, and ChemWOOT. What is WOOT? WOOT stands for Worldwide Online Olympiad Training and is a 7-month high school math Olympiad preparation and testing program that brings together many of the best students from around the world to learn Olympiad problem solving skills. Classes begin in September!

Do you have plans this summer? There are so many options to fit your schedule and goals whether attending a summer camp or taking online classes, it can be a great break from the routine of the school year. Check out our summer courses at AoPS Online, or if you want a math or language arts class that doesn’t have homework, but is an enriching summer experience, our AoPS Virtual Campus summer camps may be just the ticket! We are expanding our locations for our AoPS Academies across the country with 15 locations so far and new campuses opening in Saratoga CA, Johns Creek GA, and the Upper West Side NY. Check out this page for summer camp information.

Be sure to mark your calendars for the following events:
[list][*]March 5th (Wednesday), 4:30pm PT/7:30pm ET, HCSSiM Math Jam 2025. Amber Verser, Assistant Director of the Hampshire College Summer Studies in Mathematics, will host an information session about HCSSiM, a summer program for high school students.
[*]March 6th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar on Math Competitions from elementary through high school. Join us for an enlightening session that demystifies the world of math competitions and helps you make informed decisions about your contest journey.
[*]March 11th (Tuesday), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS Chapter Discussion MATH JAM. AoPS instructors will discuss some of their favorite problems from the MATHCOUNTS Chapter Competition. All are welcome!
[*]March 13th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar about Summer Camps at the Virtual Campus. Transform your summer into an unforgettable learning adventure! From elementary through high school, we offer dynamic summer camps featuring topics in mathematics, language arts, and competition preparation - all designed to fit your schedule and ignite your passion for learning.[/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.

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0 replies
jlacosta
Mar 2, 2025
0 replies
Scary Binomial Coefficient Sum
EpicBird08   16
N a minute ago by OronSH
Source: USAMO 2025/5
Determine, with proof, all positive integers $k$ such that $$\frac{1}{n+1} \sum_{i=0}^n \binom{n}{i}^k$$is an integer for every positive integer $n.$
16 replies
+8 w
EpicBird08
2 hours ago
OronSH
a minute ago
funny title placeholder
pikapika007   29
N 3 minutes ago by vincentwant
Source: USAJMO 2025/6
Let $S$ be a set of integers with the following properties:
[list]
[*] $\{ 1, 2, \dots, 2025 \} \subseteq S$.
[*] If $a, b \in S$ and $\gcd(a, b) = 1$, then $ab \in S$.
[*] If for some $s \in S$, $s + 1$ is composite, then all positive divisors of $s + 1$ are in $S$.
[/list]
Prove that $S$ contains all positive integers.
29 replies
+3 w
pikapika007
2 hours ago
vincentwant
3 minutes ago
usamOOK geometry
KevinYang2.71   29
N 4 minutes ago by Math-Lego
Source: USAMO 2025/4, USAJMO 2025/5
Let $H$ be the orthocenter of acute triangle $ABC$, let $F$ be the foot of the altitude from $C$ to $AB$, and let $P$ be the reflection of $H$ across $BC$. Suppose that the circumcircle of triangle $AFP$ intersects line $BC$ at two distinct points $X$ and $Y$. Prove that $C$ is the midpoint of $XY$.
29 replies
+2 w
KevinYang2.71
2 hours ago
Math-Lego
4 minutes ago
2025 USA(J)MO Cutoff Predictions
KevinChen_Yay   16
N 4 minutes ago by bjump
What do y'all think JMO winner and MOP cuts will be?

(Also, to satisfy the USAMO takers; what about the bronze, silver, gold, green mop, blue mop, black mop?)
16 replies
+3 w
KevinChen_Yay
an hour ago
bjump
4 minutes ago
No more topics!
Mathcounts States
RMarri_1018   10
N 2 hours ago by giratina3
As Mathcounts States has not started yet, I would like to ask a quick question. What would be the target goal to get to nationals in the state of Pennslyvania. I mock 34-38, so I want to know would that be enough to get me to CDR?
10 replies
RMarri_1018
Feb 24, 2025
giratina3
2 hours ago
Mathcounts States
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RMarri_1018
3 posts
#1
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As Mathcounts States has not started yet, I would like to ask a quick question. What would be the target goal to get to nationals in the state of Pennslyvania. I mock 34-38, so I want to know would that be enough to get me to CDR?
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orangebear
611 posts
#2
Y by
Since this years Pennsylvania team should be weak (As far as I know cuz all the 8th graders are gone and there were many of them) The cutoff for countdown should be 32-36 depending how hard the test is.
This post has been edited 2 times. Last edited by orangebear, Feb 24, 2025, 9:53 PM
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happypi31415
734 posts
#3
Y by
As a former MATHCOUNTS participant in PA (made nats once) i believe cutoff was around 30 for cdr both 2023 and 2024. However I don't think the team will be that strong this year b/c there were around 4 7th graders in top 20 (compare to 2023 where there were like 8) so it might be easier tbh
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RMarri_1018
3 posts
#4
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Ok Thanks
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MichaelLin16
45 posts
#5
Y by
RMarri_1018 wrote:
As Mathcounts States has not started yet, I would like to ask a quick question. What would be the target goal to get to nationals in the state of Pennslyvania. I mock 34-38, so I want to know would that be enough to get me to CDR?

in florida mathcounts 35-36 or higher is enough to get into nats
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NS0004
169 posts
#6
Y by
Probably will be less this year tho cuz the top ten didnt have too many 7th graders in florida...
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mathlover3141
7 posts
#7
Y by
if it's an easy year and other people score higher you just need to not silly questions and you will also do well
if it's a normal/hard year then the cdr cutoff is usually 30 and the top 4 cutoff is around 33-35
expect hard questions so that you won't be surprised when you actually sit down and take the test
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MichaelLin16
45 posts
#17
Y by
top 4 cutoff this year for florida was 40 :sob:
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Hanruz
6 posts
#18
Y by
Is discussion allowed now?
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c_double_sharp
289 posts
#19
Y by
Hanruz wrote:
Is discussion allowed now?

no.
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giratina3
436 posts
#20
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Hanruz wrote:
Is discussion allowed now?

Wait until April just to be safe :)
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