ka March Highlights and 2025 AoPS Online Class Information
jlacosta0
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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Introduction to Algebra A
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Introduction to Counting & Probability
Sunday, Mar 16 - Jun 8
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Introduction to Number Theory
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Introduction to Algebra B
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Intermediate: Grades 8-12
Intermediate Algebra
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MATHCOUNTS/AMC 8 Basics
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MATHCOUNTS/AMC 8 Advanced
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AMC 10 Problem Series
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Tues & Thurs, Jul 8 - Aug 14 (meets twice a week!)
AMC 10 Final Fives
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Introduction to Programming with Python
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Find the number of different ways to arrange seven people around a circular meeting table if A and B must sit together and C and D cannot sit next to each other. (Note: the order for A and B might be A,B or B,A)
Ok I’m a 6th grader in Iowa who got 38 in chapter which was first, so what are the chances of me getting in nats? I should feel confident but I don’t. I have a week until states and I’m getting really anxious. What should I do? And also does the cdr count in Iowa? Because I heard that some states do cdr for fun or something and that it doesn’t count to final standings.
Hello peoples:
I need help on a problem. If you know the solution, could you please post it, and tell me how to do it? Here is the problem:
"The product (66)(9)(22)(39) has a prime factorization of the form (2A)(3B)(11C)(13D). What is the value of ac-bd? "
{Note: 2a actually represents "2 to the power of a", same goes for 3b,11c, & 13D}
2019 Chile Classification / Qualifying NMO Juniors XXXI
parmenides515
NToday at 1:14 AM
by liyufish
p1. Consider the sequence of positive integers . which are not perfect squares. Calculate the -th term of the sequence.
p2. In a triangle , let be the midpoint of side and be the midpoint of segment . Lines and intersect at . Show that .
p3. Find all positive integers such that is a square perfect.
p4. In a party, there is a certain group of people, none of whom has more than friends in this. However, if two people are not friends at least they have a friend in this party. What is the largest possible number of people in the party?
2017 Mock ARML Team Round #7 Revenge of the incenters
parmenides511
NYesterday at 10:16 PM
by Giant_PT
Let be a triangle with side lengths ,,, incenter and circumcircle , and let be the circle that is tangent to ,, at ,,, respectively. If ,, denote the incenters of ,,, respectively, find the measure, in degrees, of the largest angle in .
Can you sum
I coined a strategy Don Sirloin Bowel's algorithm because I found it and didn't see it anywhere else. Please tell me if this looks familiar because it can have absolutely scrumptious applications. (I hope that this stuff can help you sum that.) Starting with the "golden quadratic" or whatever the sigma it's called . Multiplying by on both sides and resubstituting , we find . Continuing this process, we find ,, and so forth. We claim that We already have our base case. . Multiplying by ,. Hence, we have proved our claim by induction. Now, raising both sides to the th power, So, and Are these identities useful? And can you use them to compute the sum?
On an 8×8 checkerboard, what is the minimum number of squares that must be marked (including the marked ones) so that every square has exactly one marked neighbor? (We define neighbors as squares that share a common edge, and a square is not considered a neighbor of itself.)
Why does the combined equation have two negative solutions?
Luking1
NYesterday at 7:30 PM
by vanstraelen
It is known that the moving point is on the curve . There is a parabola with focus . Two tangent lines to are drawn through a point on , and the tangent points are and respectively. The line parallel to the line is tangent to at point . Question: When the line and have two intersection points, find the range of .\
This may make some of the information in the question useless, because I deleted the first two questions of this big question in order to avoid making the question too long and get straight to the point.\
According to the calculation, I get the analytical expression of the line as .\
At first, I thought it only needed to be not parallel to the parabola asymptotes.\
That is, the slope of the straight line , then , so ,and .\ .\
But when I checked the answer, it was wrong.\
It combines the straight line with the curve to get an equation and then uses Vieta's theorem.
\begin{cases}
y=\frac{x_0}{2} x - \frac{x_0^2}{4}
x^2=4y
\end{cases} The answer is that according to the question, the equation has two negative roots. I can't understand this, and this is exactly where my problem lies.\
Then it gets the following system of equations:
\begin{cases}
4x_0-16 \neq 0
\Delta > 0
x_1+x_2 <0
x_1\cdot x_2>0
\end{cases}
Solve, .
So we get .
I hope you can help me figure out why both roots of that equation are negative.
IMAGE
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John has a standard die with values from 1 to 6. He plays a game where, after each roll, the value on the top face permanently increases by 1. After rolling the die three times, the probability that at least one face has a value of at least 7 is given as a/b , where a and b are coprime. What is the value of a/b ?
A group of 5 students will form a travel group of 3 students. Each student is asked to select two other students they would like to travel with. Given that the probability of forming a 3-person group where each member has selected the other two is a/b , where a and b are coprime positive integers, what is the value of a/b ?
Let be a circle inscribed inside a rhombus . Let and be variable points on and respectively, such as is always the tangent line to .
Prove that for any position of and the area of triangle is the same.
Everyone was finding the questions hard...even the moderators and one of our local kids who's REALLY good at math. The highest Target score of everyone there was an 8 I believe.
bro i know the difference between those two :skull:
the joke was that in O block the district and chapter is like the worst in the nation, so somebody with a 23 overall score would probably win the cdr in that chapter
edit: sorry i didnt mean to tell that person that they did bad, SkyStone u did well 23 isnt bad
This post has been edited 2 times. Last edited by nmlikesmath, Mar 15, 2025, 4:43 AM