Questions tagged [calculation-puzzle]

A puzzle that involves numerical calculations, such as multiplication and addition. Use with the [mathematics] tag.

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5
votes
1answer
132 views

Competitive puzzles

Do you know any sort of puzzles that can work in the context of a short competition? In other words, puzzles that have these features: The premise should be fairly simple to follow (but the solution ...
6
votes
1answer
310 views

Crosswords: Maximum number of words in an n×n grid

What is the maximum number of "words spaces" that can be in an n×n crossword, based on the placement of the shaded squares. Some limitations No word can be less than 3 spaces in length ...
-4
votes
1answer
121 views

What number should be placed in that last slot? [closed]

I came across a very difficult puzzle. What number should be placed in that last slot? I only know 16 is not the correct answer, because 11 is before 10.
7
votes
2answers
554 views

Dog's mead AKA The Little Pigley Farm

This is not a puzzle, this is a question about a certain puzzle, Dog's mead. Several forms of this puzzle have been known, and I'm referring to this particular form. There are some history on that ...
4
votes
1answer
212 views

Find the missing numbers in these flowers

Can you figure out the pattern and solve for the three missing numbers? All petals and centers each contain a single digit. There is a unique solution for each missing number. Hint 1: Hint 2:
8
votes
6answers
2k views

How many scouts are there?

At camp every tent is given a number. My twin lives at the reverse of my tent number. The difference between our tent numbers ends in two. What are the lowest possible numbers of our tents? A problem ...
14
votes
1answer
653 views

The numbers on blackboard

The numbers $2020,2019,2018,...,1$ are written on the blackboard from left to right. John repeats the following process until there is only one number left: John chooses the first two numbers from ...
5
votes
2answers
194 views

Swapping the first and last digits of an integer

Take any n-digit integer (n > 1) and interchange its first and last digits. If neither of these is 0, and they are different, does it happen infinitely often that the resulting number is a multiple ...
2
votes
1answer
113 views

Calculation puzzle 006

Find the number which corresponds to the place indicated by the question mark. ...
3
votes
1answer
185 views

Calculation puzzle 005

396 ? 556 99 872 664 I tried to solve it but to no avail. Possible answers are 666, 491, 654, 999 and 917; since, the exam was multiple choice we were ...
9
votes
1answer
457 views

Pairs of Bogotá Numbers

A Bogotá number is a positive integer equal to some smaller number, or itself, times its digital product, i.e. the product of its digits. For example, 138 is a Bogotá number because 138 = 23 x (2 x 3)....
39
votes
7answers
7k views

9-5=5? Matchstick problem

Move one matchstick to make an equality. Question made by me (Is this too easy?)
7
votes
2answers
706 views

A Covid-19 puzzle: Alcohol for your School!

You are the principal of a primary school in HK. Schools are resuming soon, and you have to ensure that your school have enough alcohol. Each of the 30 classrooms should have a bottle containing 500mL ...
5
votes
0answers
167 views

Find the next country and the parameters

I created this puzzle. Denmark = [1 or 4, 11880, 1, 15, 4.433687003, 4 or 5] India = [11803, 381024, -1, 23, 0.3706062241, 5] New Zealand = [8916100448256 or 302875106592253, 43680, -1, 40, 0....
11
votes
5answers
937 views

Wizard creating a jewelry

I have a puzzle game which I am not sure how to prove that I have the right answer. The Puzzle is the following: We have a wizard which makes very special jewelry (a straight line with beads). ...
4
votes
1answer
142 views

Numbers Relation Puzzle

I've written a numbers relation puzzle, I'd like to share it with you and see what you fellas think. ------ Try to find the relation between the numbers------ Good to know: there are 2 parameters ...
0
votes
1answer
170 views

Find a relationship between single-digit numbers in groups of four [closed]

Find a relation between the following numbers: We can use only elementary arithmetic (addition, subtraction, multiplication, and division). I found this puzzle in my old book. I think there is an ...
3
votes
1answer
216 views

Three tables, One logic and Nine numbers to guess

Here is a table divided in three parts, the first two (the green and the yellow ones) are completely clear, while the last one (which is red) has 9 numbers to guess (α1, β1, γ1, δ1, α2, β2, γ2, δ2 and,...
13
votes
6answers
2k views

Create integers using 1, 2, 3, 4, 5, 6, 7 and +, -

There are numbers $1, 2,3,4,5,6,7$ and signs '$+$' and '$-$'. Using only these numbers and signs, you can compose expressions and calculate the sum (difference). Concatenation operation is not valid. ...
6
votes
2answers
461 views

Logical task for math

I have one Math puzzle to which I think I found the solution but wanted to check your opinion on it. The puzzle is the following: George has 1 banknote of 100 (the currency does not matter. Lets name ...
10
votes
4answers
762 views

Smallest integer whose first n multiples contain the digit 1

For some time now I have been investigating the function $M(n)$, the least integer such that the first $n$ multiples of $M(n)$ contain the digit $1$. Thus $M(3) = 51$, because $51$ is the smallest ...
-1
votes
1answer
86 views

Which is higher John's new salary or Brad's salary or equal? [closed]

John's salary is 30% less than Brad's salary. John left work and joined a new institution, where his salary was 30% higher than his old salary. Which is higher John's new salary or Brad's salary or ...
10
votes
1answer
254 views

Interplanetary blips and bleeps

Things were quite different in 3000 AD. We'd discovered other planets with sentient life for instance. Five to be precise. Adam, Bill, Carl, Dave, and Eric we called them, and we used the lately ...
11
votes
10answers
889 views

Four fours to get $\pi$ [closed]

Four fours is a famous puzzle (made trivial with logarithms). For this puzzle, we take inspiration from Glen O's challenge from a few years back. The rules here are slightly different, but the goal is ...
9
votes
7answers
1k views

Confusion on a math puzzle

One of my colleagues asked me below puzzle, Three friends went to a picnic. 1st and 2nd friends collected woods for cooking where 3rd friend did not participated because he was sick. 1st friend ...
6
votes
3answers
348 views

Just some simple calculation to return this pattern

Here is a table, inside there are simple operations to perform, but there are also particular numbers that don't have the same logic. So how difficult will it be to find the last number and the ...
4
votes
3answers
203 views

The death prism

One day, you are caught by a evil wizard. He presents you with a prism, and says, "You can ask me to turn this prism to any $n$-angled right prism. Then you shall fill in $1$ to $3n$ with no ...
6
votes
1answer
357 views

Can you cut through the mist?

I've created a mapping between words and complex-valued polynomials, and I've generated examples from word lists that I've I found on another puzzle. You don't need to study every one of these, but I ...
-5
votes
1answer
94 views

Burger and chips calculation puzzle [duplicate]

🥤+🥤+🥤= 30 🥤+🍟+🍟=20 🍔+🥤+🥤=25 🍔+🍔+🥤+🥤+🍟+🍟=? This is easy but fun! Try to find out the last question!
-7
votes
2answers
311 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=?
5
votes
1answer
207 views

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.
1
vote
0answers
34 views

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) (÷ × - +)
1
vote
1answer
148 views

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 ...
0
votes
1answer
213 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 ...
3
votes
2answers
141 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 (...
0
votes
1answer
103 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 ...
6
votes
2answers
204 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) (÷ × - ÷)
9
votes
0answers
416 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, ...
0
votes
1answer
324 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 ...
13
votes
9answers
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'.)
1
vote
2answers
251 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 ...
0
votes
1answer
289 views

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

Hint 1 Hint 2 Hint 3 Background on puzzle (Spoiler Alert)
3
votes
1answer
154 views

Filling the table of numbers [closed]

Given the following table: I have already found the first 4 digits: $6\cdot 3 = 18, \ \ 6\cdot 2=12$ and therefore, the first 4 digits are $1812$. I cannot determine how to continue... Any help is ...
3
votes
2answers
314 views

Numbers 1-9 All used up?

There are nine numbers from one to nine. Each are to be used only once. Take two numbers from them to make a 2-digit number. It is multiplied by a different single digit no. to get a 2-digit ...
1
vote
0answers
129 views

What could be the answer of this maths puzzle? [closed]

Found this puzzle online. Tried many possible combinations of numbers with multiplication, addition etc. Has anyone ever solved this?
-4
votes
1answer
578 views

@Math masti 1234567 [closed]

—+—=8 × — ×—=9 = = — 5 Solve this plz
4
votes
1answer
239 views

The motorcyclist's challenge

Three passengers $1,2,3$ starts out moving at constant speeds from $A$ to $B$. At the same time, a motorcyclist $M$ starts out from $B$ towards $A$ to pick the passengers up. As illustrated below: ...
6
votes
1answer
344 views

Whites capture whites and Blacks capture blacks

This is my first Chess Puzzle! Let suppose you start a Chess game. Whites' aim will be to place all their alive pieces on white squares in a minimum of moves and black will do the same, but with ...
2
votes
1answer
162 views

The France Public Holiday's Distance Grid

French Public Holidays We consider the following rules that apply to the 11 French public holidays : New Year's Day : 1st of January Easter Monday : Monday following Easter Sunday which is the next ...
7
votes
1answer
408 views

Ernie and the Chocolate Bomb

Last week when I visited Ernie he complained that his trousers had shrunk in the wash. I suggested an alternate possibility – he was putting on weight. So he decided to go on a diet and to support him,...

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