Puzzle #1:
There is a matchstick:

Add 2 more matchsticks to make the number, 11.
Puzzle #2:
There is a palace made out of 11 matchsticks:
Move 2 matchsticks to make 11 squares.
Puzzle #3:
...
$1484 / (7 / 9) = 19$
Make the equation true by moving one continuous shape or operation in the equation.
Using the digits from $1$ to $9$,
Form four numbers, such as ($X$,$Y$,$Z$,$T$)
Then take $X\div Y$ and $Z\div T$ where both values should be different than each other.
You need to use all digits ...
You are going to start from any number with distinct digits lower than four digits (such as $a$, $ab$, $abc$) and you will apply the rule below:
Take the square any number you want in the number (you ...
The Sheikh dies, leaving behind three sons, 17 camels and the following order:
His oldest son shall inherit one in two camels.
His middle son shall inherit one in three camels.
His youngest son shall ...
I was told this problem comes from Poland's biggest math competition for high school students from the year 2014. I am not sure of the answer but I am sharing since someone here can probably shed ...
You are on your way to visit your Grandma, who lives at the end of the valley. It's her birthday, and you want to give her the cakes you've made.
Between your house and her house, you have to cross 7 ...
What goes in the question mark? (Same for both equations). It is something very wellknown.
Hint:
The 28th of december 2018 will exactly be the 28th month since I date my fabulous girlfriend, by this time she'll be 18 years old. Here's a puzzle I'll give her this day :
Classical part
Maximize $...
The following is a type of logic / math puzzle I've yet to see on this site. I feel it belongs because the kernel of this problem can be reworked into other puzzles.
$N$ pirates find themselves ...
$1484 / (7 / 9) = 19$
Make the equation true by moving one continuous shape or operation in the equation.
(You are NOT allowed to make an inequality or equality sign or touch the = sign.)
You can‘t ...
someday, some math teacher decided to test the logic deduction capacity of the class consists of 32 students. When the class began, he showed a letter to each student between A to E and said:
"There ...
This was inspired by many puzzles that use three/four numbers to create other numbers. I chose these numbers in particular because of this post.
Can you find a way to make all the natural numbers ...
Can you find a way to make:
$0\ 0 \ 0 \ 0 = 8$
by adding any operations or symbols? You can use only these symbols:
$+,\ ,\ *,\ !,\ /,\ \hat\, ,\ ()$.
It is limited to this list, and ...
Your objective is to change one constant in the following equation so that it equates to true.
Rules:
No changing the equals sign.
The numbers are correct.
There only needs to be one change in order ...
Assemble a formula using the numbers $2$, $0$, $1$, and $8$ in any order that equals 109. You may use the operations $x + y$, $x  y$, $x \times y$, $x \div y$, $x!$, $\sqrt{x}$, $\sqrt[\leftroot{2}\...
Use $2$ $0$ $1 $ and $9$ to make the numbers $66, 74, 76, and$ $77$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 9 can be used.
You can make multidigit numbers out of the numbers. ...
Form two numbers. The sum of them must be $100$.
For the first one you must use the digits $4$, $5$ and $6$ taken exactly once in this order. You cannot use other digits.
For the second one you must ...
Let's suppose you want to build a house.
To do this, you're going to need people to help build the house. Specifically, you're going to need contractors, engineers, and construction workers.
After ...
Can you find a way to make:
6 5 4 3 = 1
by concatenation and/or adding any of (and only) these mathematical operators:
+

×
!
÷
^
standard parentheses ()
You cannot add other numbers to the ...
Here's a sixth one! (with a twist)
\begin{align}16&=\boxed9\times18\\5&=13\times\boxed3\\?&=9\times20\end{align}
Can you find the value of the question mark?
HINT 1:
Find the next number in the sequence
9, 73, 241, 561, 1081, 1849,____
You are given two of each from the array of 8 vegetables numbered 1 to 8 as shown above.
So in total you have 16 veggies(8 pairs). Your task is to make the longest kebab (sequence of vegetables ...
You are on your way to your friend's house. You decide to carry 2 apples to your friend. To get to their house, you must pass across 8 gates. At each gate, the keeper will take half the amount of ...
Use $2$ $0$ $1 $ and $8$ to make the number $67$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 8 can be used.
You can make multidigit numbers out of the numbers. Examples: 20, 82, ...
$1484 / (7 / 9) = 19$
Make the equation true by moving one continuous shape or operation in the equation.
Move one line and make this true: $35756858811 = $ ~ $357568584.858...$
No cross through the "=" sign stuff.
Hint:
Use all and only the digits $2,0,1,8$ once each to make the number $71$.
Allowed operations; anything not on this list is banned:
$+,,\times,\div, ()$ (parentheses and/or choose function)
...
Let Q = {1.7, 1.1, 1.4, 2.1, 2.3, s}. What is the absolute difference between the
greatest and least possible values of the median of set Q? Express your answer
as a decimal to the nearest hundredth.
...
I created this "crack the code" puzzle.
I hope the members here like it.
I am using a function, and the outputs are below. What function am I using?
function($0+0$) = 0
function($73942856628529469252$) = 1
function($1 + 1$) = 1
function($1+2$) = 1
function($528^0$) =...
This question is follow up to Something is wrong with the equation
This time our numbers are given as below included each numbers on a keyboard order and some basic math operators next to each other ...
One day, while playing Minecraft, a player ran at full speed up to a tree and dug into the ground. There, they found a mysterious note. It said:
I am a thing.
If you do something to me,
and then do ...
There is something wrong with the equation below:
By just exchanging two squares at a time, find the equality with the least amount of exchange.
For example if this question is asked for below ...
A carnie who is an extreme fan of mathematics was asked a strange question by a university student. The student asked how many rides were there total in this amusement park.
The carnie, being polite, ...
Follow up question to Make 5 5 5 5 = 19
Can you find a way to make:
$4\ 4 \ 4 \ 4 = 30$
and
$4\ 4 \ 4 \ 4 = 31$
by adding any operations or symbols on the left side of the equations? You can ...
A mathematical professor set his lock number, he used mathematics so he would remember the ten digit code. He used all of the numbers from 09, every number only once. In his mind the first two ...
This is the first in what will hopefully be a series of Unsolved Mysteries posts.
Note that this puzzle has no known solution, nor any proof that a solution is impossible. We will see how ...
An old Russian mathematician once told me this strange story...
“In a galaxy far away there is a civilized species.
The skin colors of everyone in the species is blue or green. Among the ...
A friend of mine whom I have repeatedly tried to visit has upgraded his house‘s security system. Instead of using doorkeys which were quite easy to borrow, he‘s using one of these fancy new electric ...
How do you write 23 using only the number 2? 34 using only the
number 3? 56 using only the number 5? 100 using only the
number 9?
You can use only the numbers said, but any math you want in order ...
Using the same rules as Make 6 5 4 3 = 1, but maximize the number of factorials. You may not take the factorial of 1 or 2.
This is harder than it looks. A great answer has six factorials, an ...
Can you find a way to make:
6 5 4 3 = 81
by concatenation and/or adding any of (and only) these mathematical operators:
+

×
!
÷
^
standard parentheses ()
You cannot add other numbers to the ...
A bear fell from a height of $10$ metres from ground.
It reached ground in $\sqrt2$ seconds. But somehow, it didn’t get hurt.
What is the colour of the bear?
Note : There is no ...
Can you find a way to make:
$5\ 5 \ 5 \ 5 = 19$
by adding any operations or symbols? You can use only these symbols:
$+,\ ,\ *,\ !,\ /,\ \hat\, ,\ ()$.
It is limited to this list, and ...
Which word has the highest normalized score according to the following:
Assign each individual letter A..Z of an (English) word a value corresponding to the n'th prime (see table below).
Take the ...
On an internal wiki at work, people sometime post puzzles similar to those found on this website. Most of the questions are formulated as a story or word problems, but can be expressed mathematically ...
In the faroff country of Politica, there are three main parties: the Left, the Right, and the Centre. In the last election, there were 19 million Left voters, 21 million Right voters, and 23 million ...
Can you find a way to make 1 1 1 1 = 5 by adding any operations or symbols? You can use symbols such as these: +, , *, !, ^, (). It is not limited to this list.
Good Luck!
P.S. You can not add any ...
As I got ready for work today, I had my television on Netflix as I always do. See, the thing about Netflix, they autoplay trailers for the item that is currently in focus. Well, after starting my ...