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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.

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
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
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All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

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0 replies
jlacosta
Apr 2, 2025
0 replies
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The daily problem!
Leeoz   106
N 12 minutes ago by Leeoz
Every day, I will try to post a new problem for you all to solve! If you want to post a daily problem, you can! :)

Please hide solutions and answers, hints are fine though! :)

Problems usually get harder throughout the week, so Sunday is the easiest and Saturday is the hardest!

Past Problems!
106 replies
Leeoz
Mar 21, 2025
Leeoz
12 minutes ago
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2025 MATHCOUNTS State Hub
SirAppel   551
N 2 hours ago by DhruvJha
Previous Years' "Hubs": (2022) (2023) (2024)Please Read

Now that it's April and we're allowed to discuss ...
[list=disc]
[*] CA: 43 (45 44 43 43 43 42 42 41 41 41)
[*] NJ: 43 (45 44 44 43 39 42 40 40 39 38) *
[*] NY: 42 (43 42 42 42 41 40)
[*] TX: 42 (43 43 43 42 42 40 40 38 38 38)
[*] MA: 41 (45 43 42 41)
[*] WA: 41 (41 45 42 41 41 41 41 41 41 40) *
[*]VA: 40 (41 40 40 40)
[*] FL: 39 (42 41 40 39 38 37 37)
[*] IN: 39 (41 40 40 39 36 35 35 35 34 34)
[*] NC: 39 (42 42 41 39)
[*] IL: 38 (41 40 39 38 38 38)
[*] OR: 38 (44 40? 38 38)
[*] PA: 38 (41 40 40 38 38 37 36 36 34 34) *
[*] MD: 37 (43 39 39 37 37 37)
[*] AZ: 36 (40? 39? 39 36)
[*] CT: 36 (44 38 38 36 35 35 34 34 34 33 33)
[*] MI: 36 (39 41 41 36 37 37 36 36 36 36) *
[*] MN: 36 (40 36 36 36 35 35 35 34)
[*] CO: 35 (41 37 37 35 35 35 ?? 31 31 30) *
[*] GA: 35 (38 37 36 35 34 34 34 34 34 33)
[*] OH: 35 (41 37 36 35)
[*] AR: 34 (46 45 35 34 33 31 31 31 29 29)
[*] NV: 34 (41 38 ?? 34)
[*] TN: 34 (38 ?? ?? 34)
[*] WI: 34 (40 37 37 34 35 30 28 29 29 29) *
[*] HI: 32 (35 34 32 32)
[*] NH: 31 (42 35 33 31 30)
[*] DE: 30 (34 33 32 30 30 29 28 27 26? 24)
[*] SC: 30 (33 33 31 30)
[*] IA: 29 (33 30 31 29 29 29 29 29 29 29 29 29) *
[*] NE: 28 (34 30 28 28 27 27 26 26 25 25)
[*] SD: 22 (30 29 24 22 22 22 21 21 20 20)
[/list]
Cutoffs Unknown

* means that CDR is official in that state.

Notes

For those asking about the removal of the tiers, I'd like to quote Jason himself:
[quote=peace09]
learn from my mistakes
[/quote]

Help contribute by sharing your state's cutoffs!
551 replies
SirAppel
Apr 1, 2025
DhruvJha
2 hours ago
J
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Doubt on a math problem
AVY2024   12
N 2 hours ago by derekwang2048
Solve for x and y given that xy=923, x+y=84
12 replies
AVY2024
Apr 8, 2025
derekwang2048
2 hours ago
J
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9 Was the 2025 AMC 8 harder or easier than last year?
Sunshine_Paradise   188
N 2 hours ago by jkim0656
Also what will be the DHR?
188 replies
1 viewing
Sunshine_Paradise
Jan 30, 2025
jkim0656
2 hours ago
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HMMT Masters Round
rrusczyk   0
Feb 16, 2011
For those of you college students who miss the camaraderie and challenge of on-site math competitions, the Harvard-MIT Math Tournament offers a college competition. Here's a note from Maria Monks and Rishi Gupta, AoPSers who are running the competition:

[quote="Maria Monks and Rishi Gupta"]
The HMMT (Harvard-MIT Math Tournament) Masters Round is an annual math contest for undergraduates, written by former HMMT directors and problem czars. The contest aims to bring the spirit of competition and the art of problem solving into higher mathematics, with challenging problems in abstract algebra, analysis, topology, combinatorics, calculus, linear algebra, and number theory at the undergraduate level. The Masters Round will consist of a 4 hour, proof-based test with 10 questions of varying difficulty.

Any student currently enrolled in an undergraduate institution is eligible to compete, and awards are given to the top 7 undergraduates. Additionally, there will be prizes awarded for particularly clever or elegant solutions. College graduates may also compete, but they will not be eligible for awards.

The team scoring is as follows. Any undergraduate institution with more than five participating undergraduates automatically becomes a team, and that team comprises all the undergraduates from that school. A school's team score is the sum of the ranks of the top 5 individuals from that school, after all non-team participants are removed from the results. Ties are broken by the 6th place individuals from the respective schools.

Problem submissions from college graduates are welcome. Please send any ideas you may have to hmmt-masters@mit.edu. College graduates are also invited to help grade after the contest on April 2, including those who are competing unofficially, and free dinner will be provided for volunteers.

The second annual Masters Round will be held at Harvard University in the Science Center, Hall A, on April 2, 2011. For details and to sign up, please visit http://hmmt.mit.edu/masters. Hope to see you there![/quote]
0 replies
rrusczyk
Feb 16, 2011
0 replies
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No more topics!
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AMC 8, 2000 Problem 1
dw22winner   2
N Mar 31, 2025 by HannaC
Aunt Anna is $42$ years old. Caitlin is $5$ years younger than Brianna, and Brianna is half as old as Aunt Anna. How old is Caitlin?

$\mathrm{(A)}\ 15\qquad\mathrm{(B)}\ 16\qquad\mathrm{(C)}\ 17\qquad\mathrm{(D)}\ 21\qquad\mathrm{(E)}\ 37$
2 replies
dw22winner
Nov 27, 2024
HannaC
Mar 31, 2025
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AMC 8, 2000 Problem 1
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AMC 8
2000
Problem 1
middle school math
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dw22winner
71 posts
dw22winner
#1 h  Nov 27, 2024, 3:05 PM
Y by
Aunt Anna is $42$ years old. Caitlin is $5$ years younger than Brianna, and Brianna is half as old as Aunt Anna. How old is Caitlin?

$\mathrm{(A)}\ 15\qquad\mathrm{(B)}\ 16\qquad\mathrm{(C)}\ 17\qquad\mathrm{(D)}\ 21\qquad\mathrm{(E)}\ 37$
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V0305
666 posts
V0305
#2 h  Nov 27, 2024, 3:09 PM • 1 Y
Y by dw22winner
Solution
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HannaC
7 posts
HannaC
#3 h  Mar 31, 2025, 10:18 PM
Y by
Hiii. So, what you need to do is sort of like working backwards. First you find out Brianna’s age, which is 42/2=21, then you find Caitlin’s age by doing 21-5 which is 16. The answer is B.
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