# Questions tagged [mathematics]

A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

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### What's the graph relation? #2

What's the relation that joins the nodes? Open the image in a new tab if you'd like to see the diagram with better resolution. Previous What's the graph relation? #1 Hint 1
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### What's the graph relation? #1

What is the relation that connects the nodes of this digraph?
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### Name that node #2

What is the value of the unknown node? Previous Name that node #1 (Beginner's Level Puzzle)
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### Name that node #1 (Beginner's Level Puzzle)

While Puzzling.SE has some extremely clever and difficult puzzles that are being solved by people whose intellect amazes me, I wanted to make some graph puzzles that were specifically meant for ...
143 views

### Decode the number to get a color!

These numbers in some way represents 4 commonly used colors: 25536, 187669382, 3043469, 11599 Can you decode it? Include the answer and your thought process to get the check mark. Let me know if you ...
315 views

### A simple children's riddle

Here is a riddle written on a cup: Eh is four times as much as Oi, Oh is four times as little as Ai, What do you get if you add all four of them up? Source: Russian Olympiad Problems, ...
130 views

### Minimum number of clues required for a 16 x 16 Sudoku

It is well-known that the minimum number of clues that completely specify a 9 x 9 Sudoku is 17. What is the minimum number of clues required for a 16 x 16 Sudoku whose cells contain one of the ...
134 views

### Burger and chips calculation puzzle 2 [closed]

This is easy though I think it is very fun to think about! S+S+S=30 S+H+H=20 H+F+F=9 H+F*S=?
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### Colourful puzzle

Can you find appropriate number to complete this puzzle? :D Also, don't forget to consider colors given to each grid. They will help you a lot to find final answer.
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### Use all of the following symbols and numbers in one equation for the result to be equal to 10 [duplicate]

Use all of the following symbols and numbers in one equation for the result to be equal to 10 (14, 12, 9 , 7, 3) (÷ × - +)
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### Calculation puzzle 004

20 ~ 32 = 100 22 ~ 19 = 25 81 ~ 50 = 81 24 ~ 22 = ? Possible answers: 225, 196, 121, 625 or 400. I saw this question on the internet, these question types are YÖS exam questions and as seen from ...
180 views

### Mathematical puzzle 003

I saw this question on Math group and tried to solve it question to no avail. I approached it by taking the square of the first row, adding it to the second, then subtracting the fourth row from the ...
475 views

### What exclusive club is this?

You stumbled across a letter accidentally sent to you. It bears an official looking (though archaic) seal and the contents are as follows: TO whom it may concern: Thank you for your interest ...
116 views

### Mathematical puzzle 002

7 # 4 = 5 1 # 1 = 2 3 # 2 = 5 4 # 3 = ? Possible answers: 1, 2, 3, 4 or 5 In this puzzle, I tried to take square of each number and subtracting them or adding them, for instance 49 + 16 = 65 (...
1k views

### What is larger than largest, your intuitions are tarnished. (What am I?)

You might call me a number, but that would be a blunder. In class you may have been told otherwise, but I tell you now that those were all lies. I'm in the deck of the cards, as big as them come. ...
92 views

### Mathematical puzzle 001 [closed]

18 ~ 21 = 9 45 ~ 90 = 0 16 ~ 12 = 4 67 ~ 12 = ? I tried to solve it by taking LCM of each number, square rooting them, adding each digit, multiplying them and many other ways. However, I couldn't ...
106 views

### A complex matter of relations (What am I?)

There is many-a-kind of number, which sometimes makes me feel dumber. Let's say that we start from zero to four, and see if that leads us to learn some more. Some numbers you might see as a ...
137 views

### Use all of the following symbols and numbers in one equation

Use all of the following symbols and numbers in one equation for the result to be equal to 10 (14, 12, 9 , 7, 3) (÷ × - ÷)
101 views

### Which node(s) does 0 connect with in this simple graph?

If we add 0 as a node to the graph below, which node(s) will it connect to? Hint 0 Hint 1 Hint 2
181 views

### A constant gaze

What this infinite spiral seems to be gazing at goes without saying. Yet, to go on and on heedlessly as if trying to prove something, let’s just say it represents an equality with a well-known ...
145 views

### Please solve this number puzzle [closed]

This is a puzzle for logical minds. Please explain me the answer, with steps.
172 views

### Today I give you a mathematical pleasure, which you might want to take up and measure (What am I?)

Today I give you a mathematical pleasure, which you might want to take up and measure. With a pole, or a hole, oh well, you might want to read up on Borel. My spirit can always be found in myself, ...
499 views

### A real time-waster: the clock of confusion and color

John was doing his math problems like a good child one day until he looked at the clock to see if it was time to sleep. To his dismay, the blasted thing had become another math problem! But this one ...
290 views

### I'm a number with a special product, so name me when you think you've got it

In the blocks that come before, their special product tells us more. To guess my scheme you'll need calculation, but only little tests of recreation. Each block contains atoms strong as Thor, ...
134 views

### Make the numbers 1-100 using 8 8s

Rules: Make the numbers 1-100 using eight 8s Use the operations + - * / exponentiation and ! No Rounding as in $(\sqrt{88}+8*8+8+8+8)/8= 12$ No using other digits Multi digit numbers ...
4k views

### How to get 32 by using +1 , +1 , ×3 , ×3 , ÷2 , ÷2, ^2, ^2?

How to get 32 by using +1,+1,×3,×3,÷2,÷2,^2,^2? (The last two operators are 'squaring'.)
169 views

### Make the numbers 1-100 using six 6s

Rules: Make the numbers 1-100 using six 6s Use the operations + - * / exponentiation and ! No Rounding as in $((6 - (6 + 6) / 6) + 6!!) / 6 = 9$ No using other digits Multi digit ...
235 views

### What's the number in the last node of this directed graph?

Hint 1 Hint 2 Hint 3 Background on puzzle (Spoiler Alert)
426 views

### Which node(s) does 16 connect with in this simple graph?

If we add 16 as a node to the graph below, which node(s) will it connect to? Hint 1 Hint 2 Hint 3 Hint 4 Hint 5
1k views

### What node does 11 point to?

If we included 11 in the diagram below, which node would it connect to? Hint 1
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### Exceptional numbers, neither good nor bad

Behold, my new comrades, a monstrous yet straightforward puzzle, appearing on the order of that group of fellows occasionally visiting PSE but hitherto unable to join their simple friends. I assure ...
166 views

### UFO in a hurry #1: land at a power plant

A UFO is at one kilometer altitude, and one kilometer due east of a power plant on the ground it wants to investigate. The UFO has infinite acceleration but is limited to a speed of ( altitude + 1km )...
1k views

### Five minutes puzzle: Multiway switches

Here's an easy puzzle that should take you only five minutes to solve, inspired by my hallway. Most intuitive answer get the mark: Six switches control the same light bulb in a multiway switching ...