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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]
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
Apr 2, 2025
0 replies
1500th Post!
PikaPika999   7
N 15 minutes ago by DreamineYT
I hit my 1500th post!!

To "celebrate" I guess this is a marathon for the 24 game! :)

3,3,8,8
7 replies
PikaPika999
an hour ago
DreamineYT
15 minutes ago
0.999..=1???
EaZ_Shadow   77
N 29 minutes ago by LXC007
Alright, I was thinking about why 0.999...=1 one day, and remembered something from learning calculus. Technically, subtracting 0.999... from 1 gives 0.000...0001 (infinitely many zeros). This is really close to zero, however I will denote as 0+, as it indeed is greater than 0, even by the smallest margin. Now take the differences (1-0.999...999) and add them up infinitely many times. Should it be zero? No because of the 0+, its a bit greater than 0, so adding it up infinitely many times would be greater than 0... Whats's wrong with my reasoning?
77 replies
EaZ_Shadow
3 hours ago
LXC007
29 minutes ago
Math with Connect4 Boards
Math-lover1   0
32 minutes ago
Hi! So I was playing Connect4 with my friends the other day and I wondered: how many "legal" arrangements of Connect4 can be reached at the ending position?

We assume that we do not stop the game when there is a four in a row, and we have 21 red pieces and 21 yellow pieces. We also drop the pieces one by one into a standard 7 by 6 board. We can start the game with any color piece.

https://en.wikipedia.org/wiki/Connect_Four

Initial Thoughts
Attempt to use one-to-one correspondences
0 replies
Math-lover1
32 minutes ago
0 replies
1234th Post!
PikaPika999   257
N an hour ago by PikaPika999
I hit my 1234th post! (I think I missed it, I'm kinda late, :oops_sign:)

But here's a puzzle for you all! Try to create the numbers 1 through 25 using the numbers 1, 2, 3, and 4! You are only allowed to use addition, subtraction, multiplication, division, and parenthesis. If you're post #1, try to make 1. If you're post #2, try to make 2. If you're post #3, try to make 3, and so on. If you're a post after 25, then I guess you can try to make numbers greater than 25 but you can use factorials, square roots, and that stuff. Have fun!

1: $(4-3)\cdot(2-1)$
257 replies
PikaPika999
Apr 21, 2025
PikaPika999
an hour ago
No more topics!
ENTER YOUR CHAPTER INVITATIONAL SCORE
ihatemath123   106
N Apr 23, 2025 by Soupboy0
I'll start:
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
ihatemath123&7&26&6&38 \\


\hline
\end{tabular}
106 replies
ihatemath123
Feb 27, 2021
Soupboy0
Apr 23, 2025
ENTER YOUR CHAPTER INVITATIONAL SCORE
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G H BBookmark kLocked kLocked NReply
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ihatemath123
3446 posts
#1 • 5 Y
Y by tenebrine, kavya.rajesh, Mango247, RainbowJessa, GodGodGodGodGoose
I'll start:
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
ihatemath123&7&26&6&38 \\


\hline
\end{tabular}
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cubingsoda
19220 posts
#2 • 4 Y
Y by tenebrine, kavya.rajesh, RainbowJessa, GodGodGodGodGoose
Wait how do you know your total
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bestzack66
5191 posts
#3 • 4 Y
Y by tenebrine, kavya.rajesh, RainbowJessa, GodGodGodGodGoose
forester2015 wrote:
Wait how do you know your total

Click to reveal hidden text

sprint + 2 * target
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ihatemath123
3446 posts
#4 • 3 Y
Y by tenebrine, RainbowJessa, GodGodGodGodGoose
forester2015 wrote:
Wait how do you know your total

I printed the contest out.
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sidchukkayapally
669 posts
#6 • 3 Y
Y by tenebrine, RainbowJessa, GodGodGodGodGoose
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
ihatemath123&7&26&6&38 \\
\\ \hline
sidchukkayapally&7&28&5&38 \\

\hline
\end{tabular}
This post has been edited 1 time. Last edited by sidchukkayapally, Feb 27, 2021, 7:28 PM
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Testking
164 posts
#7 • 4 Y
Y by tenebrine, RainbowJessa, GodGodGodGodGoose, EthanNg6
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\ 
\hline
ihatemath123&7&26&6&38 \\ 
\hline
sidchukkayapally&7&28&5&38 \\
\hline
\end{tabular}
This post has been edited 2 times. Last edited by Testking, Feb 27, 2021, 7:32 PM
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ilovepizza2020
12156 posts
#8 • 3 Y
Y by tenebrine, RainbowJessa, GodGodGodGodGoose
Testking wrote:
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\ 
\hline
ihatemath123&7&26&6&38 \\ 
\hline
sidchukkayapally&7&28&5&38 \\
\end{tabular}
FTFY
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Bluedevils
1503 posts
#9 • 3 Y
Y by tenebrine, RainbowJessa, GodGodGodGodGoose
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\ 
\hline
ihatemath123&7&26&6&38 \\ 
\hline
sidchukkayapally&7&28&5&38 \\
\hline
Bluedevils&7&26&5&36 \\
\end{tabular}
sad :( why was target so hard
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beep123
258 posts
#10 • 4 Y
Y by tenebrine, Mango247, RainbowJessa, GodGodGodGodGoose
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\ 
\hline
ihatemath123&7&26&6&38 \\ 
\hline
sidchukkayapally&7&28&5&38 \\
\hline
Bluedevils&7&26&5&36 \\
\hline
beep123&7&25&5&35 \\
\end{tabular}
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BananaWatch5223
362 posts
#11 • 2 Y
Y by tenebrine, GodGodGodGodGoose
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\ 
\hline
ihatemath123&7&26&6&38 \\ 
\hline
sidchukkayapally&7&28&5&38 \\
\hline
Bluedevils&7&26&5&36 \\
\hline
BananaWatch5223&7&24&6&36 \\
\hline
beep123&7&25&5&35 \\
\end{tabular}
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Overlord123
799 posts
#12 • 3 Y
Y by tenebrine, RainbowJessa, GodGodGodGodGoose
sillied two sprint questions for 33 :noo: someone add me, im in 8th grade, 23 sprint, 5 target
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math31415926535
5617 posts
#13 • 3 Y
Y by tenebrine, ivyshine13, GodGodGodGodGoose
I think its okay if you think you didn't do that well, if its hard for you, its hard for other people and you might get surprised with the results.
This post has been edited 1 time. Last edited by math31415926535, Feb 27, 2021, 7:40 PM
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hi_im_bob
903 posts
#14 • 4 Y
Y by ilovepizza2020, tenebrine, justin6688, GodGodGodGodGoose
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\
\hline
hi\_im\_bob&8&30&7&44 \\
\hline
ihatemath123&7&26&6&38 \\
\hline
sidchukkayapally&7&28&5&38 \\
\hline
Bluedevils&7&26&5&36 \\
\hline
BananaWatch5223&7&24&6&36 \\
\hline
beep123&7&25&5&35 \\
\end{tabular}
This post has been edited 3 times. Last edited by hi_im_bob, Feb 27, 2021, 7:46 PM
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Testking
164 posts
#16 • 2 Y
Y by tenebrine, GodGodGodGodGoose
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\
\hline
hiimbob&8&30&7&44 \\
\hline
ihatemath123&7&26&6&38 \\
\hline
sidchukkayapally&7&28&5&38 \\
\hline
Bluedevils&7&26&5&36 \\
\hline
BananaWatch5223&7&24&6&36 \\
\hline
beep123&7&25&5&35 \\
\hline
Overlord123&8&23&5&33 \\
\hline
\end{tabular}
This post has been edited 1 time. Last edited by Testking, Feb 27, 2021, 7:45 PM
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Bedwarspro
437 posts
#17 • 2 Y
Y by tenebrine, GodGodGodGodGoose
hi_im_bob wrote:
\begin{tabular}{|c|c|c|c|c|}Username&Grade&Sprint&Target&TOTAL \\ \hline
Testking&6&29&8&45 \\
\hline
ihatemath123&7&26&6&38 \\
\hline
sidchukkayapally&7&28&5&38 \\
\hline
Bluedevils&7&26&5&36 \\
\hline
BananaWatch5223&7&24&6&36 \\
\hline
beep123&7&25&5&35 \\
\hline
hi\_im\_bob&8&30&7&44
\end{tabular}

do "\_" to produce underscore
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