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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
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.

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[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
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0 replies
jlacosta
Apr 2, 2025
0 replies
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Books for AMC 10
GallopingUnicorn45   4
N 7 minutes ago by GallopingUnicorn45
Hi all,

So I'm in 4th grade, and I'm having a go at AMC 10 and I've got some questions.
First, how many questions are needed to get Achievement Roll and AIME?
Second, what should I grind to prepare? I took the Intro to Algebra, Counting & Probability, and Number Theory courses already, completed those three books and will be starting the Intro to Geometry book soon. I'm planning to grind the Competition Math for Middle School and try to add in Volume 1: The Basics along with the three books that I already finished, plus geometry. Is there anything else to prepare with besides Alcumus and past papers and those books?

Thanks!
4 replies
GallopingUnicorn45
Today at 2:26 AM
GallopingUnicorn45
7 minutes ago
J
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random problem i just thought about one day
ceilingfan404   16
N 17 minutes ago by MathPerson12321
i don't even know if this is solvable
Prove that there are finite/infinite powers of 2 where all the digits are also powers of 2. (For example, $4$ and $128$ are numbers that work, but $64$ and $1024$ don't work.)
16 replies
ceilingfan404
Apr 20, 2025
MathPerson12321
17 minutes ago
J
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Two similar geometry question
ERMSCoach   0
26 minutes ago
I have two questions for you to solve.
However, the particular question I am asking here is
Given the 1st question has answer x, find an easy solution to 2nd question in terms of x.
Essentially are these the same question, or is it a coincidence that the answers are similar?

First question, Equilateral triangle ABC has circle O tangent to BC and passing through A. Circle O intersects AB and AC at D and E, with AD=10 and AE=11. What is the length of BC?

Second question, Quadrilateral ABCD has AB=3, AD=4, B and D are right angles, C is 60 degrees.
What is the length of AC?
0 replies
ERMSCoach
26 minutes ago
0 replies
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0!??????
wizwilzo   61
N 27 minutes ago by K1mchi_
why is 0! "1" ??!
61 replies
wizwilzo
Jul 6, 2016
K1mchi_
27 minutes ago
J
No more topics!
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k I cannot into nationals, what should I do?
AMathCountsguy10   97
N Mar 9, 2025 by Shaarav14
I am an eighth grader in North Carolina and I am sort of pressured to make nats this year, I only got 26 on last year's state test (orz to @mathprodigy2011) and I have mocked 39, 40, and 37 on the 2014, 2015, and 2022 tests respectively. I am aiming for a 40 this year because that seems to be the cutoff. How should I sufficiently improve? My test is on March 14th, 2025.

To be more clear, last year I got 16/10 and on the tests I have mocked, I got 27/12, 26/14, and 25/12.
97 replies
AMathCountsguy10
Feb 21, 2025
Shaarav14
Mar 9, 2025
J
I cannot into nationals, what should I do?
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Reveal topic tags
Mathcounts Nationals
MATHCOUNTS
North Carolina
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AMathCountsguy10
933 posts
AMathCountsguy10
#89 h  Mar 2, 2025, 6:07 PM
Y by
Soda + protein + significant salt content before test
every test
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EaZ_Shadow
1236 posts
EaZ_Shadow
#90 h  Mar 2, 2025, 6:22 PM
Y by
sanaops9 wrote:
Boba is scientifically proven to be the best

I chug 5 energy drinks, sweat on some games, then i start the test
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Soupboy0
342 posts
Soupboy0
#91 h  Mar 2, 2025, 6:28 PM
Y by
what if ur fasting an u cant eat anything before the competition?
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mathprodigy2011
319 posts
mathprodigy2011
#92 h  Mar 2, 2025, 6:31 PM
Y by
Soupboy0 wrote:
what if ur fasting an u cant eat anything before the competition?

thats fine, id just make sure im not going hungry or thirsty during the competition(so eat lots before you start the fasting)
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AMathCountsguy10
933 posts
AMathCountsguy10
#93 h  Mar 5, 2025, 2:18 AM
Y by
Lol /bump
I mocked 2021 state and got 45 (29/16) sillied S21 but second-guessed T8 at the last moment lowk the test was pretty easy there were just some insights u needed to see
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ostriches88
1527 posts
ostriches88
#94 h  Mar 6, 2025, 5:27 PM • 1 Y
Y by RocketScientist
one very specific bit of advice i have is to make sure you know how your calculator works

i had practiced with a diff calculator for all my practice/mock tests, so when i walked into target round with my brand new fancy calculator, i sillied 2 problems while having correct expressions that i just had to plug into my calculator, and missed nats by 3 pts
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AtlantisII
559 posts
AtlantisII
#95 h  Mar 6, 2025, 5:36 PM
Y by
ostriches88 wrote:
one very specific bit of advice i have is to make sure you know how your calculator works

i had practiced with a diff calculator for all my practice/mock tests, so when i walked into target round with my brand new fancy calculator, i sillied 2 problems while having correct expressions that i just had to plug into my calculator, and missed nats by 3 pts

your not supposed to say that :skull:
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ostriches88
1527 posts
ostriches88
#96 h  Mar 6, 2025, 5:37 PM
Y by
AtlantisII wrote:
ostriches88 wrote:
one very specific bit of advice i have is to make sure you know how your calculator works

i had practiced with a diff calculator for all my practice/mock tests, so when i walked into target round with my brand new fancy calculator, i sillied 2 problems while having correct expressions that i just had to plug into my calculator, and missed nats by 3 pts

your not supposed to say that :skull:

for clarity this happened at nc states last year
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AtlantisII
559 posts
AtlantisII
#97 h  Mar 6, 2025, 11:15 PM
Y by
ostriches88 wrote:
AtlantisII wrote:
ostriches88 wrote:
one very specific bit of advice i have is to make sure you know how your calculator works

i had practiced with a diff calculator for all my practice/mock tests, so when i walked into target round with my brand new fancy calculator, i sillied 2 problems while having correct expressions that i just had to plug into my calculator, and missed nats by 3 pts

your not supposed to say that :skull:

for clarity this happened at nc states last year

oh oops sry
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ostriches88
1527 posts
ostriches88
#98 h  Mar 6, 2025, 11:55 PM
Y by
AtlantisII wrote:
oh oops sry

all good, you did the right thing pointing it out

better safe than sorry

+ i should have clarified lol
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AMathCountsguy10
933 posts
AMathCountsguy10
#99 h  Mar 7, 2025, 7:34 PM
Y by
alr so I am doing intro to CP and get ~90-95% right and about ~65% on the first try (my first solution) any tips (2/3 of my wrong problems are cp)
realised posted on 1434
This post has been edited 1 time. Last edited by AMathCountsguy10, Mar 7, 2025, 7:34 PM
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Soupboy0
342 posts
Soupboy0
#100 h  Mar 7, 2025, 7:36 PM
Y by
bro is in the eastern time zone (doxxed)
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AMathCountsguy10
933 posts
AMathCountsguy10
#101 h  Mar 7, 2025, 10:11 PM
Y by
buddy didnt u read the op im already in nc how can i not be in est
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AMathCountsguy10
933 posts
AMathCountsguy10
#102 h  Mar 9, 2025, 1:59 AM
Y by
/bump
anyways i only mocked 35 on 2024 state (its rly hard)
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Shaarav14
191 posts
Shaarav14
#103 h  Mar 9, 2025, 7:35 PM
Y by
I am in NC, and from Carnage. TMSA Cary is better though. I would have made it to chapter and state, but kind of blundered on very easy questions.
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