# Questions tagged [calculation-puzzle]

A puzzle that involves numerical calculations, such as multiplication and addition.

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### 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 ...
190 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 ...
91 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.
183 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 ...
106 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:
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 ...
92 views

### Calculation puzzle 006

Find the number which corresponds to the place indicated by the question mark. ...
167 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 ...
665 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 ...
136 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....
896 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). ...
113 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 ...
215 views

### What is this alchemist's message?

My friend told me the other day that an alchemist's manuscripts was found. Along with the typical runes and workings of those in search of the Philosopher's Stone, a sheaf of parchment was found with ...
160 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,...
1k 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. ...
442 views

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 ...
85 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 ...
208 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 ...
550 views

### Four fours to get $\pi$

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 ...
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 ...
328 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 ...
296 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 ...
82 views

### Burger and chips calculation puzzle [duplicate]

🥤+🥤+🥤= 30 🥤+🍟+🍟=20 🍔+🥤+🥤=25 🍔+🍔+🥤+🥤+🍟+🍟=? This is easy but fun! Try to find out the last question!
138 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=?
181 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.
33 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) (÷ × - +)
125 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 ...
190 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 ...
118 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 (...
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 ...
141 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) (÷ × - ÷)
296 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, ...
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'.)
237 views

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

Hint 1 Hint 2 Hint 3 Background on puzzle (Spoiler Alert)
135 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 ...
283 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 ...
85 views

### @Math masti 1234567 [closed]

—+—=8 × — ×—=9 = = — 5 Solve this plz
220 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: ...
307 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 ...
152 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 ...
138 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,...
281 views

### It looks similar, but not the same

The puzzle: The solution is a single number, which replaces the question mark. Good luck!
277 views

### Missing number inside square with hints

After solving it for days i am exhausted with patterns.
369 views

### Missing numbers inside square

Below puzzle have some missing number .Can you find them ? . Hint #1 Hint #2 Hint #3
133 views

### Triangular conundrum

Place any three numbers on the vertices of a triangle: 5 / \ / \ / \ 8-------4 Calculate their differences, going one way: 5 / \ -3 / ...
360 views

### Open the third door!

I was wandering in an abandoned house. When I went down to the basement I found three doors. All three doors have a triangle painted on them, two of them with a number outside the triangle, these ...
446 views

### Keys, codes and patterns

My flatmate always forgets his key, so now we have installed a small locker outside the room where a spare is located. So that my flatmates doesn't forget the code we made this small riddle for him, ...
189 views

### How to find numbers in the puzzle square box [closed]

I was trying to find answers for below diagram.I simplified with four equation as a+b = 25 c-d = 35 a+c = 50 b+d = 60 then I got ...