Hey! Wanted to share with you all the Thanksgiving Arithmetic Dash!

Practice Test: Start Test
Official Thanksgiving Arithmetic Dash: Start Test

This is a fun-filled 180 second long exciting test of your speed arithmetic skills. Find out how you rank among the top mathletes across the world!

If this is your first contest, we recommend participating in the PRACTICE contest to get familiar with the format.

Certificates will be sent to those who perform in one of the following categories:

Top 10% Overall: Thanksgiving Arithmetic Dash Worldwide Honor Roll Certificate

Top 10% in your Region (Your Country, or (if USA) US State): Thanksgiving Arithmetic Dash National (or Regional) Honor Roll Certificate

Top 10% in your Age level (Ages 4 and under, Ages 5-6, Ages 7-8, Ages 9-10, Ages 11-14, Ages 15-18, Age 19-22, Age 23-30, Age 31-60, Age 61+). (Please note: If you are age 13 or under, you may register under a parent or guardian's email.)

In addition, the top 10 participants in each of these categories will receive a special certificate recognizing their placement (e.g. 1st place in Ages 5-6, or 3rd place in Canada)

Partial results will be immediately available as soon as you complete the test.

Full results and certificates will be sent at the end of the contest window - on Thursday November 28th, 2024.

We recommend you take the contest on a computer. There will be a 3-second timer before the contest starts — and then the 3 minute timer will start immediately. You will not need to hit enter — if you type in the correct answer it will automatically move you to the next question

Calculators are strictly prohibited — if you are found to be using external aids you will be disqualified.

Good luck!

Hey! Wanted to share a sneak peak of the new MathDash Book — hopefully it can help with your math training!

Included in this sneak peak are chapters on Primes and Divisors, Power of a Point, Ptolemy's Theorem, Linearity of Expectation, and Generating Functions, along with over 100 practice problems in total — in a unique timed contest format (different from any other book!).

Would love to hear feedback — this will help us add more content and improve it!

https://mathdash.com/book

(if that doesn't work, try this link)

Hey! As Codeforces becomes more and more like MathForces, would love to share with you all a handout I wrote to help teach some introductory number theory. There is a handout explaining some basic techniques, followed by five 'dashes' meant to test your understanding. Hope you enjoy!

Prime Factors and Divisors Handout

Prime Factors and Divisors Contest 1
Prime Factors and Divisors Contest 2
Prime Factors and Divisors Contest 3
Prime Factors and Divisors Contest 4
Prime Factors and Divisors Contest 5

Hey! Wanted to share a beautiful combinatorics problem — the best short-answer problem I've seen recently. Try it when you have 15 minutes to spare since your submission will be timed :)

Beautiful Combinatorics Problem

Hope you all enjoy! There is a solution on the 'post-contest' screen.

Hey! As you all study up math in preparation for the next MathForces round, would love to share some subject-based problem sets compiled from old competitions that you may enjoy. Each of these was chosen because they were either nice or educational. They each have a difficulty rating — if there are any you find uninteresting, I'd recommend trying ones of a higher difficulty!

The fun part about these is you can do them in a competitive setting against a lot of other contestants, with a rating :)

Hope you enjoy! (Higher difficulty rating means harder)

Algebra Set 1 #1 (800)
Algebra Set 1 #2 (800)
Algebra Set 1 #3 (1200)
Algebra Set 1 #4 (1200)
Algebra Set 1 #5 (1200)
Algebra Set 1 #6 (1300)
Algebra Set 1 #7 (1400)
Algebra Set 1 #8 (1300)
Algebra Set 1 #9 (1400)
Algebra Set 1 #10 (1400)
Algebra Set 1 #11 (1400)
Algebra Set 1 #12 (1400)
Algebra Set 1 #13 (1400)

Algebra Set 2 #1 (800)
Algebra Set 2 #2 (1200)
Algebra Set 2 #3 (1200)
Algebra Set 2 #4 (1400)
Algebra Set 2 #5 (1600)
Algebra Set 2 #6 (1600)
Algebra Set 2 #7 (1600)
Algebra Set 2 #8 (1700)
Algebra Set 2 #9 (1700)
Algebra Set 2 #10 (1800)
Algebra Set 2 #11 (1800)
Algebra Set 2 #12 (1800)
Algebra Set 2 #13 (1600)
Algebra Set 2 #14 (1800)
Algebra Set 2 #15 (1800)
Algebra Set 2 #16 (1800)
Algebra Set 2 #17 (1900)
Algebra Set 2 #18 (2000)

Geometry Set 1 — #1 (1400)
Geometry Set 1 — #10 (2300)
Geometry Set 1 — #2 (1400)
Geometry Set 1 — #3 (1600)
Geometry Set 1 — #4 (1600)
Geometry Set 1 — #5 (1600)
Geometry Set 1 — #6 (1600)
Geometry Set 1 — #7 (1600)
Geometry Set 1 — #8 (1700)
Geometry Set 1 — #9 (2000)

Number Theory Set 1 #1 (1200)
Number Theory Set 1 #2 (1200)
Number Theory Set 1 #3 (1300)
Number Theory Set 1 #4 (1400)
Number Theory Set 1 #5 (1600)
Number Theory Set 1 #6 (1600)
Number Theory Set 1 #7 (1600)
Number Theory Set 1 #8 (1400)
Number Theory Set 1 #9 (1700)
Number Theory Set 1 #10 (1700)
Number Theory Set 1 #11 (1700)
Number Theory Set 1 #12 (1800)
Number Theory Set 1 #13 (1800)
Number Theory Set 1 #14 (1800)
Number Theory Set 1 #15 (2000)
Number Theory Set 1 #16 (2000)
Number Theory Set 1 #17 (2100)
Number Theory Set 1 #18 (2300)
Number Theory Set 1 #19 (2500)

Hey! As Codeforces slowly turns into Mathforces, we know you're looking for ways to boost those math skills!

We at MathDash are excited to announce the launch of our new Ask for Help! feature!

Get fast 1-on-1 help math tutoring at any time you want it! In order to get 1 on 1 help, we ask that you:

• Choose a contest to participate in, and take the contest! You can choose any contest here — if you are looking to train a specific topic, I'd recommend looking here. If you can't decide, message me and I can suggest one specifically for your level!
• After completing a contest, simply hover over any problem you'd like assistance with, then click Ask for Help to connect with a tutor. We will respond as soon as possible!
• If you have general questions about how to approach math training, first log into MathDash and make an account, and then connect with a tutor here (Note: This link will only work after you've made an account and are logged in!)

Whether it's mastering new techniques or reviewing tricky problems, we've got you covered!

Welcome to the Ellipsis Labs Math Challenge, hosted by Ellipsis Labs on Saturday Sept 21, 8am ET

Register Now for the Ellipsis Labs Math Challenge — $500 in Prizes

This is an official, sponsored one hour math challenge designed to simulate the types of problem-solving skills you will need to succeed at Ellipsis Labs. It'll be a great experience for anybody looking to break into crypto, quantitative finance, or anybody looking for a fun challenge. You will have 60 minutes to solve 10 questions. Winners will be chosen according to who solves the most problems in the shortest amount of time. You must also be at least 18 years old to be eligible for prizes, or have parental consent.

In order to be eligible for prizes — please register in advance here and fill out the Google Form linked in the event description.

Participants will be competing for a $500 prize pool of Amazon Gift Cards.

1st: $150

2nd: $100

3rd: $75

4th: $50

5th: $40

6th: $30

7th: $20

8th: $15

9th: $10

10th: $10

Good luck!

A quick note about the sponsor for this contest:

Ellipsis Labs — Building the liquidity backbone of DeFi.

High throughput blockchains have enabled the creation of new financial primitives. Ellipsis Labs is building Phoenix, a decentralized limit order book on Solana that is fully on-chain, non-custodial, and crankless.

https://ellipsislabs.xyz/

Congratulations to the Winners of Live Dash 1 — thank you to the over 100 participants who joined in on the excitement :) — full results can be seen here

Live Dash 2 is being hosted by MathDash on Saturday Sept 21, 1pm ET — if you enjoyed Live Dash 1, we'd love to see you back!

In order to be eligible for prizes — please register in advance here

You will have 10 minutes to solve 10 questions — this is an extremely exciting speed math event! Winners will be chosen according to who solves the most problems in the shortest amount of time. This is a live event — meaning prizes will be determined by what the results are exactly 12 minutes after the start time (giving you a 2 minute buffer period to start). a Participants will be competing for a $71 prize pool of Amazon Gift Cards.

You are not allowed to use any external aids other than paper and pencil. Good luck!

Prize Distribution — $25 — $10 — $8 — $7 — $6 — $5 — $4 — $3 — $2 — $1

Welcome to the Live Dash 1, hosted by MathDash on Saturday Sept 14, 1pm ET

You will have 10 minutes to solve 10 questions — this is an extremely exciting speed math event! Winners will be chosen according to who solves the most problems in the shortest amount of time. This is a live event — meaning prizes will be determined by what the results are exactly 12 minutes after the start time (giving you a 2 minute buffer period to start).

In order to be eligible for prizes — please register in advance here

Participants will be competing for a $63 prize pool of Amazon Gift Cards.

You are not allowed to use any external aids other than paper and pencil. Good luck!

Prize Distribution — $25 — $10 — $8 — $7 — $6 — $5 — $4 — $3 — $2 — $1

Hey everyone!

To do better at Codeforces contests, a great way is to improve your Math skills!

Wanted to suggest this Counting and Probability Problemset — it has five problems each in 14 different topics:

• Counting
• Venn Diagrams
• Casework
• Complementary Counting
• Handshakes
• Pascal's Triangle
• Combinations
• Paths in a Grid
• Stars and Bars
• States (Markov Chains)
• Generating Functions
• Linearity of Expectation
• Vandermondes
• Burnsides

Each problem either has a solution or a source link (if you click on the source, it will take you to a discussion thread with the solution! Ask here if you are having trouble finding the solution to any question). Those who complete the set of questions will be honored in the Hall of Fame!

You can also check how many times each question has been solved, as well as who has solved each question — in the Summary Tab :)

Welcome to the I HRT Math Challenge, hosted by Hudson River Trading on Saturday Sept 7, 11am ET

Register Now for the I HRT Math Challenge — $500 in Prizes

This is an official, sponsored one-hour math challenge designed to simulate the types of problem-solving skills you will need to succeed at HRT. It'll be a great experience for anybody looking to break into quant or anybody looking for a fun challenge. You will have 60 minutes to solve 10 questions. Winners will be chosen according to who solves the most problems in the shortest amount of time. You must also either be at least 18 years old, or have parental consent, to be eligible for prizes.

In order to be eligible for prizes — please register in advance here and fill out the Google Form linked in the event description.

Participants will be competing for a $500 prize pool of Amazon Gift Cards.

1st: $150

2nd: $100

3rd: $75

4th: $50

5th: $40

6th: $30

7th: $20

8th: $15

9th: $10

10th: $10

Top 20 will also receive some coveted HRT SWAG.

Good luck!

A quick note about the sponsor for this contest:

HRT — Build the future of trading.

Hudson River Trading (HRT) brings a scientific approach to trading financial products. We have built one of the world's most sophisticated computing environments for research and development. Our researchers are at the forefront of innovation in the world of algorithmic trading. At HRT we welcome a variety of expertise: mathematics and computer science, physics and engineering, media and tech. We’re a community of self-starters who are motivated by the excitement of being at the cutting edge of automation in every part of our organization – from trading, to business operations, to recruiting and beyond. We value openness and transparency, and celebrate great ideas from HRT veterans and new hires alike. At HRT we’re friends and colleagues – whether we are sharing a meal, playing the latest board game, or writing elegant code. We embrace a culture of togetherness that extends far beyond the walls of our global offices.

Hi! We've released a new Matches game mode on MathDash — with the goal of helping you test your speed math skills 1 on 1 against the field!

Click Play Countdown in the Matches Tab Here to get started!

See how high you can get your rating — a full leaderboard is here (under Countdown Rating)

Hey Codeforces!

Wanted to share this exciting opportunity to get your school or Math club to join the 2024-25 MathDash Regular Season!

This is a series of weekly math contests that are made available to coaches of Math Teams or organizations, with the goal of creating a fun and exciting 10-minute activity for your school's math team! There are three divisions of varying difficulty. The competition is taken individually by all members of your math team on a computer or mobile phone, and scores of other teams are shown live as students work through the questions. Every week your school moves up or down the leaderboard according to your performance!

Registration is open now — only coaches of Math Teams may register — so please forward this to your Math Team's coach or organization head and have them register the team!

Hey!

Wanted to share this series of Counting and Probability Educational Contests — that can serve as a fun way to practice counting & probability from the AMC 8 level all the way through the hard AIME level — while competing live with some of the best Mathletes in the world!

Problems are mostly AMC/AIME problems with some others sprinkled in — and are chosen to optimize for educational value!

We recommend that you pull out your nearest Counting and Probability book or read a handout on the topic before you dive in to this test so that you are maximally prepared :)

Counting Educational Contest
Venn Diagrams Educational Contest
Handshakes Educational Contest
Casework Educational Contest
Combinations Educational Contest
Paths On A Grid Educational Contest
Complementary Counting Educational Contest
Stars and Bars Educational Contest
Pascal's Triangle Educational Contest

Harder
Linearity of Expectation Educational Contest
Generating Functions Educational Contest
Vandermondes Educational Contest
Burnsides Educational Contest
States Educational Contest

Bonus (Non Counting and Probability — not AMC/AIME questions — and different format, with full solutions)
Power of a Point Educational Contest (Hard)
Power of a Point Educational Contest (Easier)
System of Equations Educational Contest (Hard)
System of Equations Educational Contest (Easier)

Hi!

AdityaTakkar and I want to help start a Mathematics Community on MathDash for students from India! MathDash is a community with many different mathematics contests of all difficulties, where you receive a rating and can work to improve it, much like Codeforces.

Please indicate interest by joining the group page (click the green 'Join India' button)

In order to appear on the leaderboard, you must complete 5 rated contests — all of which are available here! I suggest doing the Daily Dashes, those are quite fun :)

We will be gating this specific leaderboard to only members from India, but are happy to help make groups for other communities — if you have an active community of math enthusiasts that wish to have a group leaderboard, message me and I will make you one!

Hey everyone! Exciting news for all math enthusiasts! MathDash is hosting an online global math competition tomorrow, featuring problems inspired by quant interview questions. Get ready for brainteasers, challenging probability questions, and much more. This is a fantastic opportunity to prepare for quant interviews or simply enjoy some stimulating math problems.

Time: Saturday, August 3, 2024 at 12 PM ET

Contest Registration: Register here

Problem flavors: Brainteasers, tough probability questions, and more.

Contest format: 10 minutes, 40 questions.

Registration process: Make an account on the MathDash website and click "Register".

Good luck on the contest, and happy problem solving!

(For more information and to participate, visit: MathDash Quant Contest — and if you wish to practice your skills before the contest starts, try to participate in our first Quant Contest here!)

Hey! Wanted to share with you all the Arithmetic Dash! Rated

Arithmetic Dash 1: Start Test

Arithmetic Dash 2: Start Test

Format: You will be given 2 minutes to answer as many arithmetic questions as you can. The world record is 185, see how close you can get :)

Good luck and happy solving!

Hey! Wanted to bring to you all the First Live MathDash Internet Math Olympiad! — Rated and with Prizes

Time: Saturday July 13 at 10AM EST

Lower Division Contest: Join here

Upper Division Contest: Join here

Proof-based competition: Solve and prove each question.

Problem difficulties: Upper division is meant for participants training for their national math olympiads, or the IMO. Lower division is meant for those newer to olympiad math.

Time limit: 120 minutes for 5 problems (division upper) and 7 problems (division lower).

Rated contest: Only the problems you open will affect your rating. Ratings depend on your score, your current rating, and the problem's rating (determined by solvers' ratings).

Grading: Submissions graded LIVE during the round! You can resubmit as many times as you wish.

Regrade policy: Dispute scores in the post-contest discussion chat. Grading is at our discretion.

Good luck and happy solving!

(The first olympiad, if you are interested, can be found here: Olympiad 1)
(The second olympiad, if you are interested, can be found here: Olympiad 2 — which also has links to problems 2 through 8) (The third olympiad can be found here: Olympiad 3 Lower and Olympiad 3 Upper)

Hey! Wanted to share with you all the launch of the MathDash Math Olympiad Rating and Leaderboard!

Proof-based competition: Solve and prove each question.

Problem difficulties: The six problems on a recent International Math Olympiad should be ratings ~2100/2500/3000/2100/2500/3000. Rating 1000 should be approachable for anyone with any math background!

Grading: Submissions graded ASAP (likely after the round).

Regrade policy: Dispute scores in the post-contest discussion chat. Grading is at our discretion.

Good luck and happy solving!

(1200) Olympiad 2 — Problem 1
(1200) Positive Sum In Collection
(1400) Planet Htrae
(1400) Round Table
(1400) Product in Grid
(1500) Olympiad 2 — Problem 3
(1500) Four Integers Number Theory
(1500) Right Triangles
(1500) Fraction Integer Inequality
(1600) Olympiad 2 — Problem 2
(1600) Find the numbers
(1700) Olympiad 2 — Problem 4
(1700) Circumcircles
(1700) Divisor Sequence
(1700) Make The Hexagon
(1700) Find the Coins
(1700) Infinite Good Primes
(1800) Olympiad 2 — Problem 5
(1800) Geometry Inequality
(1800) Arithmetic Progression
(1800) Infinite Solutions
(2000) Olympiad 2 — Problem 6
(2000) Parallelogram Congruent Angles
(2100) Sequence Bound
(2200) Finding Sequences
(2200) Sequence Gets Large
(2200) Tangent Circles
(2200) Increasing Functions
(2500) Olympiad 2 — Problem 7
(2500) Sum of p-th powers
(2500) Power of 2
(2800) Olympiad 2 — Problem 8

Hey! Wanted to bring to you all the first Olympiad Dash Contest!

Join here

Proof-based competition: Solve and prove each question.

Problem difficulties: These are meant to be speed questions that are potentially doable fast — but it is still quite challenging! If you are preparing for Math Olympiads like your country's national math olympiad or the IMO, this will be very fun :)

Point values: 500 points for each problem. Score formula: round(point value * your score out of 7 * 1/7).

Time limit: 15 minutes for 7 problems.

Grading: Submissions graded ASAP (likely after the round). You can resubmit if graded during the contest.

Regrade policy: Dispute scores in the post-contest discussion chat. Grading is at our discretion.

Good luck and happy solving!

Hey! Wanted to bring to you all the Third MathDash Olympiad Contest! — Rated (and with a new Proof rating!)

Lower Division Contest: Join here

Upper Division Contest: Join here

You may only do one of these — but can choose which one you wish to do!

Proof-based competition: Solve and prove each question.

Problem difficulties: Upper division is meant for participants training for their national math olympiads, or the IMO. Lower division is meant for those newer to olympiad math. The last three problems in lower are the first three problems in upper.

Point values: 500, 1000, 1500, 2000, 2500 for each division. Score formula: round(point value * your score out of 7 * 1/7).

Time limit: 120 minutes for 5 problems.

Rated contest: Only the problems you open will affect your rating. Ratings depend on your score, your current rating, and the problem's rating (determined by solvers' ratings).

Grading: Submissions graded ASAP (likely after the round). You can resubmit if graded during the contest.

Regrade policy: Dispute scores in the post-contest discussion chat. Grading is at our discretion.

Good luck and happy solving!

(The first olympiad, if you are interested, can be found here: Olympiad 1)
(The second olympiad, if you are interested, can be found here: Olympiad 2 — which also has links to problems 2 through 8)

Hey! Wanted to bring to you all the Second MathDash Olympiad Contest!

The contest features proof-based problems where you must solve and prove each question. The last three problems are as difficult as those found in standard math olympiads, such as the International Math Olympiad (IMO).

The question point values are $$$500, 1000, 1500, 2000, 2500, 3000, 3500, 4000$$$. Your score for each problem is calculated as

$$$\text{round}\left(\text{point value} \cdot \dfrac{\text{your score out of 7}}{7}\right)$$$.

Each problem has its own time limit, and you can attempt as many or as few problems as you like. Your overall score is the sum of the points you earn from the problems you attempt. You can attempt the problems at any time — even on different days!

Problems:

Problem 1 (30 min): Problem 1

Problem 2 (30 min): Problem 2

Problem 3 (45 min): Problem 3

Problem 4 (45 min): Problem 4

Problem 5 (1 hour): Problem 5

Problem 6 (1 hour): Problem 6

Problem 7 (1.5 hours): Problem 7

Problem 8 (1.5 hours): Problem 8

This is a rated contest, and only the problems you open will affect your rating. Your rating depends on your score, your current rating, and the problem's rating (determined by solvers' ratings).

Submissions will be graded ASAP, likely after the round. You can resubmit if your submission is graded during the contest.

You can dispute scores in the post-contest discussion chat. Grading is at our discretion.

Good luck and happy solving!

The first Olympiad, if you are interested, can be found here: Olympiad 1

Think of this as a Codeforces Global Round — but for Math :)

We hope you enjoy the problems!

Hey! Wanted to bring to you all the first MathDash Olympiad Contest!

The time limit is 4.5 hours — you can take it at anytime here.

There are $$$8$$$ problems, meant to start at a level approachable to contestants at all math abilities, and end at a typical Olympiad level — with the last three problems meant to match the difficulty of the International Math Olympiad.

The question point values are $$$500, 1000, 1500, \cdots, 4000$$$. If your proof for problem 8 scores a $$$6$$$ out of $$$7$$$, you will receive $$$\text{round}(4000 \cdot \frac67) = 3429$$$ points. Ties are broken by time of last submission. You are allowed to submit as many times as you wish.

Note: Your submission's score is only finalized once a number shows up in your entry on the scoreboard — with no number, it is considered pending

We ask that you do not discuss this contest except in the Discussion chat room and forum that will be made available to you after the contest.

Think of this as a CodeForces Global Round — but for Math :)

We hope you enjoy the problems!

Hey! MathDash looks a lot different now — we hope you find it exciting! We have a thriving community of mathletes participating in Contests and working to improve their Blitz and Classical ratings. Would love to hear thoughts from the CodeForces community!

Link to MathDash Lobby

I'd recommend starting with the KMMC is a great and enjoyable short first contest — 25 questions in 5 minutes. See how you fare against the other MathDash mathletes! :) Link to the KMMC contest is here

Hello Codeforces!

We are hosting four live and exciting rated 15-minute 15-problem rounds, at 7 PM for the Under 1400 division, and then 7:30 PM, 8 PM, and 8:30 PM for everyone! (all ET) — This is a cool opportunity to compete with some really good mathletes!

You can Register Here for Lightning 4, 5, 6, and 7 (note: this will take you to Lightning 5, you can click on 'Contests' to register for the others! If your rating is 1400 or above, you will be unable to register for Lightning 4) and/or join the discussion in Discord — and then come back at the competition time for an exciting round!

Hope to see you there! (Pictured is Lightning Round 3 from a few days ago :) )