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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
May 1, 2025
May is an exciting month! National MATHCOUNTS is the second week of May in Washington D.C. and our Founder, Richard Rusczyk will be presenting a seminar, Preparing Strong Math Students for College and Careers, on May 11th.

Are you interested in working towards MATHCOUNTS and don’t know where to start? We have you covered! If you have taken Prealgebra, then you are ready for MATHCOUNTS/AMC 8 Basics. Already aiming for State or National MATHCOUNTS and harder AMC 8 problems? Then our MATHCOUNTS/AMC 8 Advanced course is for you.

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[*]May 20th, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 1 Math Jam, Problems 1 to 4, join the Canada/USA Mathcamp staff for this exciting Math Jam, where they discuss solutions to Problems 1 to 4 of the 2025 Mathcamp Qualifying Quiz!
[*]May 21st, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 2 Math Jam, Problems 5 and 6, Canada/USA Mathcamp staff will discuss solutions to Problems 5 and 6 of the 2025 Mathcamp Qualifying Quiz![/list]
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0 replies
jlacosta
May 1, 2025
0 replies
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100th post!!!
whwlqkd   2
N 2 hours ago by whwlqkd
Hello,I am Seohyung Jo,8th grade student from South Korea. I couldn’t think I write many posts. But now,it is my 100th post!!!! As many people do these kind of posts(like 1000th post),I do this post.

Because this is my 100th post,I will share some problems:make 100

Make 100 with these numbers and +,-,*,/,!,^,nCr,nPr
Level 1(easy):20,25,30,35,40
Level 2(medium):1,3,4,5,7
Level 3(hard):1,2,3,4,5
Level 4(extreme):2,3,6,8,9
Level X:2,3,3,4,4
2 replies
whwlqkd
Yesterday at 1:12 PM
whwlqkd
2 hours ago
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Function equation
hoangdinhnhatlqdqt   2
N 3 hours ago by jasperE3
Find all functions $f:\mathbb{R}\geq 0\rightarrow \mathbb{R}\geq 0$ satisfying:
$f(f(x)-x)=2x\forall x\geq 0$
2 replies
hoangdinhnhatlqdqt
Dec 17, 2017
jasperE3
3 hours ago
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Compilation of functions problems
Saucepan_man02   4
N 4 hours ago by lightsbug
Could anyone post some handout/compilation of problems related to functions (difficulty similar to AIME/ARML/HMMT etc)?

Thanks..
4 replies
Saucepan_man02
May 7, 2025
lightsbug
4 hours ago
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9 Mathcounts Nats Winner Poll
DhruvJha   61
N 4 hours ago by isache
We've had these the past year, but not this one so lets create a poll.
61 replies
DhruvJha
Today at 12:19 AM
isache
4 hours ago
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Favorite Memory at MATHCOUNTS
MathRook7817   19
N 4 hours ago by MathPerson12321
Hey guys, what is everyone's favorite memory at any Mathcounts competition?

Mine was arriving at the hotel for the 2024 nats comp.
19 replies
MathRook7817
Today at 12:31 AM
MathPerson12321
4 hours ago
J
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How many nonnegative integers
Darealzolt   1
N 5 hours ago by elizhang101412
How many nonnegative integers can be written in the form
\[ a_7 \cdot 3^7 + a_6 \cdot 3^6 + a_5 \cdot 3^5 + a_4 \cdot 3^4 + a_3 \cdot 3^3 + a_2 \cdot 3^2 + a_1 \cdot 3^1 + a_0 \cdot 3^0 \]where \( a_i \in \{-1, 0, 1\} \) for \( 0 \le i \le 7 \)?
1 reply
Darealzolt
5 hours ago
elizhang101412
5 hours ago
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How much sides does M and N have
Darealzolt   0
5 hours ago
Two regular polygons have \( m \) sides and \( n \) sides, respectively. The total number of sides is 33, and the total number of diagonals is 243. What are the values of \( m \) and \( n \)?
0 replies
Darealzolt
5 hours ago
0 replies
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Mathcounts Countdown Round Hub
DhruvJha   29
N Today at 3:51 AM by RocketScientist
We will post cdr updates for those who are blocked at school! Also put your current rankings and predictions.
29 replies
DhruvJha
Yesterday at 11:58 PM
RocketScientist
Today at 3:51 AM
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PIE practice
Serengeti22   0
Today at 3:20 AM
Does anybody know any good problems to practice PIE that range from mid-AMC10/12 level - early AIME level for pracitce.
0 replies
Serengeti22
Today at 3:20 AM
0 replies
J
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Square number
linkxink0603   5
N Today at 1:44 AM by linkxink0603
Find m is positive interger such that m^4+3^m is square number
5 replies
linkxink0603
May 9, 2025
linkxink0603
Today at 1:44 AM
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Functions
Entrepreneur   5
N Today at 12:33 AM by RandomMathGuy500
Let $f(x)$ be a polynomial with integer coefficients such that $f(0)=2020$ and $f(a)=2021$ for some integer $a$. Prove that there exists no integer $b$ such that $f(b) = 2022$.
5 replies
Entrepreneur
Aug 18, 2023
RandomMathGuy500
Today at 12:33 AM
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Logarithmic function
jonny   2
N Yesterday at 11:09 PM by KSH31415
If $\log_{6}(15) = a$ and $\log_{12}(18)=b,$ Then $\log_{25}(24)$ in terms of $a$ and $b$
2 replies
jonny
Jul 15, 2016
KSH31415
Yesterday at 11:09 PM
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book/resource recommendations
walterboro   0
Yesterday at 8:57 PM
hi guys, does anyone have book recs (or other resources) for like aime+ level alg, nt, geo, comb? i want to learn a lot of theory in depth
also does anyone know how otis or woot is like from experience?
0 replies
walterboro
Yesterday at 8:57 PM
0 replies
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Engineers Induction FTW
RP3.1415   11
N Yesterday at 6:53 PM by Markas
Define a sequence as $a_1=x$ for some real number $x$ and \[ a_n=na_{n-1}+(n-1)(n!(n-1)!-1) \]for integers $n \geq 2$. Given that $a_{2021} =(2021!+1)^2 +2020!$, and given that $x=\dfrac{p}{q}$, where $p$ and $q$ are positive integers whose greatest common divisor is $1$, compute $p+q.$
11 replies
RP3.1415
Apr 26, 2021
Markas
Yesterday at 6:53 PM
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Geometry
BQK   15
N Apr 26, 2025 by b2025tyx
Help me, Why geometry is so difficult to learn
15 replies
BQK
Apr 24, 2025
b2025tyx
Apr 26, 2025
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Geometry
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Reveal topic tags
geometry
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BQK
1 post
BQK
#1 h  Apr 24, 2025, 2:58 PM • 1 Y
Y by PikaPika999
Help me, Why geometry is so difficult to learn
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MathWinner121
525 posts
MathWinner121
#5 h  Apr 24, 2025, 3:56 PM • 2 Y
Y by EthanNg6, PikaPika999
BQK wrote:
Help me, Why geometry is so difficult to learn

Focus on understanding the material instead of memorizing the material.
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anticodon
160 posts
anticodon
#6 h  Apr 24, 2025, 5:07 PM • 2 Y
Y by sangriabeaver5, PikaPika999
draw a good diagram
(don't be that one person who draws an 110 degree angle that looks more like 40 degrees)
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bluedino24
123 posts
bluedino24
#9 h  Apr 25, 2025, 1:25 PM
Y by
BQK wrote:
Help me, Why geometry is so difficult to learn
It's good to keep focus on what you are trying to find. Many geometry problems are disguised as something complicated and messy, but are really simple as soon as you spot the right thing. Practice in general will help you get better at doing this. :)
This post has been edited 1 time. Last edited by bluedino24, Apr 25, 2025, 1:26 PM
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jb2015007
1954 posts
jb2015007
#14 h  Apr 25, 2025, 3:33 PM
Y by
js do p sets on amc trivial:https://amctrivial.com/?problems=2013_AMC_12A_Problems/Problem_11|2019_AMC_10A_Problems/Problem_19|2015_AIME_II_Problems/Problem_2|2010_AIME_I_Problems/Problem_8|2023_USAJMO_Problems/Problem_1
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Andrew2019
2312 posts
Andrew2019
#18 h  Apr 25, 2025, 4:25 PM
Y by
practice geo sets on mathdash
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sweetmailbox
45 posts
sweetmailbox
#29 h  Apr 25, 2025, 8:25 PM
Y by
@bluedino24 I respect the amount of patience you have, and I aspire to apply that when I do math.
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bluedino24
123 posts
bluedino24
#30 h  Apr 25, 2025, 8:27 PM
Y by
sweetmailbox wrote:
@bluedino24 I respect the amount of patience you have, and I aspire to apply that when I do math.
REDACTED
This post has been edited 1 time. Last edited by bluedino24, Apr 25, 2025, 8:28 PM
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bluedino24
123 posts
bluedino24
#33 h  Apr 25, 2025, 8:29 PM
Y by
K3mchi_ wrote:
what i would have said: (i expect this acc to be banned and myself to never grace these forums again…)

oop
the argument has been taken down
i expect this thread to be muted
bluedino24 wrote:
K1mchi_ wrote:
my advice never puts anyone down

if anyone is put down by my posts they are too sensitive. They should work to be better like me.

the only thing i will acknowledge is ur lack of respect
Hey, I don't want to argue... I respect every opinion you have. if you think you're the best person in the world, I won't argue with that. I just want to point out that most of your posts are flamewars that are off topic because of your lack of respect to others.

The people who truly are the best do not claim they are.

my lack of self respect? i respect myself plenty and i hope u can see that far

“ The people who truly are the best do not claim they are.” must be false because i claim i am the best
Maybe it's a good time to stop. The best people know when's the right time and when it's not.

Also, maybe it's time for you to enroll in an LA class...? You seem to be struggling with understanding the point I am trying to get across...
This post has been edited 3 times. Last edited by bluedino24, Apr 25, 2025, 8:42 PM
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sadas123
1299 posts
sadas123
#35 h  Apr 26, 2025, 1:15 AM • 1 Y
Y by RollingPanda4616
I would say that for Geo, I just did all of the Alcumus Geo for it and then I practiced by doing past AMC 8 Final 5 Geo, then I started to do first 15 AMC 10 Geo, then Idk know what's next, maybe just try to do Olympiad Geo after this like euclidian Geo I am not sure
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valisaxieamc
442 posts
valisaxieamc
#36 h  Apr 26, 2025, 4:07 AM
Y by
K3mchi_ wrote:
bluedino24 wrote:
Maybe it's a good time to stop. The best people know when's the right time and when it's not.

Also, maybe it's time for you to enroll in an LA class...? You seem to be struggling with understanding the point I am trying to get across...

you fail to understand my antics and motives

You mean wasting other people's time? All the people in here, go here to learn or have fun not to hear your stupid comments on forums that serve no purpose. Can you not bring others down so you can feel better about yourself. Also you are in no position to talk, the most math you have done is amc 8 and you yourself said you sold on it. Why are you trying to talk down people who are better then you
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Evanlovemath
74 posts
Evanlovemath
#37 h  Apr 26, 2025, 4:13 AM • 1 Y
Y by mithu542
Why are you guys even arguing about this, someone just wanted help in geometry. Bruh.
This post has been edited 1 time. Last edited by Evanlovemath, Apr 26, 2025, 4:13 AM
Reason: b
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Evanlovemath
74 posts
Evanlovemath
#38 h  Apr 26, 2025, 4:14 AM • 1 Y
Y by mithu542
please stop arguing :)
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bluedino24
123 posts
bluedino24
#41 h  Apr 26, 2025, 2:51 PM
Y by
K3mchi_ wrote:
how is learning abt K1mchi wasting time?

just bc they did better on 30 math comps does not mean they are better
I'm glad my life isn't sad to the extent where I have to go around saying I'm the best in the world, and having to create two accounts to "learn about myself". Thanks for getting a laugh out of me today. :D
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b2025tyx
1475 posts
b2025tyx
#42 h  Apr 26, 2025, 2:53 PM
Y by
This guy just joined less than 24 hours ago
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b2025tyx
1475 posts
b2025tyx
#44 h  Apr 26, 2025, 3:04 PM
Y by
A response :

BQK joined yesterday at 11:26 am.

BQK is that guy

Johnny is alive

Johnny has a tuff jacket
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