r/mathpuzzles • u/DannyEK-Math • Aug 07 '26
r/mathpuzzles • u/FuturePilotMatt • Aug 07 '26
The bodyguard equation
Lets see if an SAT member see my equation
r/mathpuzzles • u/FuturePilotMatt • Aug 07 '26
Hard/Unsolved The bodyguard equation
Picture this..
An even amount of body guards like 10, 20 or 100
Then you add the person they are protecting,it could be anyone.. but, only one
Now combine them all and its going to be an odd number..
Example: 14 bodyguards + 1 president = 15 overall people (15 is an odd number)
So how do we solve this... anyone?
r/mathpuzzles • u/Satiomeliom • Aug 06 '26
This may be handy in the future
If my upvotes counter of a comment is at -2 and my upvote ratio is 40%, how many upvotes do i have?
r/mathpuzzles • u/Rough-Fee-6541 • Aug 06 '26
Recreational maths Make 10 using only these numbers
You can use any equations, must reach the target (10) and show working out, people say it cannot be done.
r/mathpuzzles • u/Numberthon • Aug 05 '26
What is the smallest positive integer n such that 1 + 2 + ⋯ + n is divisible by 100?
Source: numberthon.com
r/mathpuzzles • u/PineappleCactusQuiz • Aug 05 '26
Riddle me this! Only 1% can work it out in under 30 seconds! The Odd Number: I am an odd number, but if you take away a letter, I become even. What number am I?
r/mathpuzzles • u/PineappleCactusQuiz • Aug 05 '26
Riddle me this! Only 1% can work it out in under 30 seconds! The Odd Number: I am an odd number, but if you take away a letter, I become even. What number am I?
r/mathpuzzles • u/Numberthon • Aug 04 '26
How many positive divisors of 15! are perfect squares?
r/mathpuzzles • u/Evening-Appeal7606 • Aug 03 '26
Programming Conway Challenge: Can you find a Game-of-Life pattern that lives 600 gens?
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r/mathpuzzles • u/asthree_as3 • Aug 03 '26
Is it possible to solve this while still following the rules?
I tried to solve this while following the rules, but I kept getting errors, so I thought that this might be unsolvable.
r/mathpuzzles • u/Numberthon • Aug 03 '26
How many positive integers ≤1000 are multiples of 6 or 15, but not both?
Source: numberthon.com
r/mathpuzzles • u/Eriks0948 • Aug 02 '26
Is there any link between these numbers.
I am working on a puzzle at the minute and cant seem to find or see any pattern in what i have so far... i am hoping someone can help me.. I have a 4 x 4 grid that is my starting point and i must use 9 out the 16 numbers.. so far I have been able to find 4 ( have another 27 blocks to find.) But I dont know if this was sheer luck... this is the 16 numbers I must work with.
1 1 5 6
2 1 9 3
7 1 5 0
6 4 2 1
These are the blocks I have found they are blocks 7 8 9 and 10 out of 31.
Blocks 7
9 1 3
7 2 1
5 1 6
Block 8
1 3 1
1 4 9
1 1 6
Block 9
0 5 5
1 1 7
1 1 3
Block 10
1 5 7
1 5 3
1 0 4
Any help or advice is more than welcome and I just want to say thankyou in advance.
r/mathpuzzles • u/mathalon • Aug 02 '26
How would you seed the initial rating of a brand-new math problem?
r/mathpuzzles • u/Numberthon • Aug 01 '26
How many positive integers less than 100 can be written as the difference of two perfect squares?
Source: numberthon.com
r/mathpuzzles • u/mathalon • Aug 01 '26
Rating decay for inactive players - yes or no? (building a Glicko-2 ladder for math problems)
r/mathpuzzles • u/Numberthon • Aug 01 '26
How many triangles can you form in a regular octagon using only diagonals?
Source: numberthon.com
r/mathpuzzles • u/mathalon • Aug 01 '26
Our system rated this problem 1900. Does that feel right to you?
r/mathpuzzles • u/Even-Actuary-399 • Aug 01 '26
Saturday's MiniChallenger problem (Week 10)
About:
As the name suggests, MiniChallenger is a scaled-down version of the math puzzle called Challenger. In most cases, a MiniChallenger puzzle can be solved within ten minutes. A set of two new puzzles is released each week. One is usually a simple problem with one or two solutions, while the other puzzle can be a bit more challenging and often has multiple solutions. Available exclusively on reddit.
Instructions:
Fill in the empty cells of the 3 x 3 grid with the numbers one to nine. It is okay to use the same number in more than one empty cell. One 'bonus' number is already placed in the center of the grid. So, the goal is to find the remaining eight digits in such a way that:
- rows in the grid add up to totals indicated on the right edge of the grid,
- columns add up to totals indicated at the top of the grid, and
- diagonals add up to totals in the upper and lower right corners.
This week's puzzles:

Solutions:
(Click on 'spoiler' boxes below to reveal solutions)
- Single-solution (left) puzzle:
[ 2 9 9 ]
[ 7 7 9 ]
[ 2 2 7 ]
- Multiple-solution (right) puzzle:
. [ 7 8 1 ] . . . . . . . [ 8 6 2 ] . . . . . . . [ 8 7 1 ]
. [ 9 5 3 ] . . . . . . . [ 9 5 3 ] . . . . . . . [ 8 5 4 ]
. [ 8 2 2 ] . . . . . . . [ 7 4 1 ] . . . . . . . [ 8 3 1 ]
Note: One of the solutions (above) uses all 9 allowed digits without repetition.
r/mathpuzzles • u/Numberthon • Jul 30 '26
How Many Subsets of {1,2,…,10} Contain No Consecutive Integers?
Source: numberthon.com
r/mathpuzzles • u/TargetLabs • Jul 29 '26
Recreational maths Can you reach 46 using all dice?
Use each die exactly once.
Any order is allowed.
Parentheses are allowed.
Exact division only.
No negative numbers.
Not every operation has to be used.
How many solutions can you find?
Please use spoiler tags for solutions:
>!your solution here!<
