Questions tagged [calculation-puzzle]

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

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votes
2answers
1k views

Arrange to get sum of 450 when it is added row wise and column wise

I just came across a maths puzzle,where i should get the sum of 9 numbers(multiples of 10) to be 450 both horizontally and vertically in a 9x9 matrix. Picture attached for reference:
5
votes
5answers
2k views

Sum of rows and columns.

In the puzzle, each square is to contain a digit from one to nine. No digit can appear twice in the same row or column. The sums of each row and column are given. Find one of the two solutions. In ...
11
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2answers
751 views

Mike's Coin Duplicator

This is my first mathematical puzzle on the site. To be honest, I don't know if this should go to M.SE or here. Any grammatical or backstory edits are welcome, as I realized that my English is not ...
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2answers
176 views

Monkey with Coins Killing [duplicate]

10 people can share a bucket of coins equally. A monkey steals one coin. The number of coins remaining is therefore 1 less than would allow them to be shared out equally. One person after another ...
2
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1answer
331 views

Find the Cell Number, free the Mayor

Last night, the mayor of a small town was kidnapped. 2000 suspects have been brought into the local prison based off eyewitness reports as to what the suspect looked like.One of these 2000 suspects is ...
9
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1answer
1k views

What is the rule these numbers follow?

Each row in this grid of numbers follows a specific pattern or rule: ...
3
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8answers
963 views

An exercise on the powers without using the logarithm function

One can find on the forums a lot of exercise where the pupils call for help to solve their maths, once I came across an exercise similar to this one: Determine with a simple (non-scientific) ...
2
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1answer
177 views

Gambling problem [closed]

I have a Gambling problem. One night I go out and get to a casino and do the usual, get my regular at the bar for only $10 tonight at the bar and head over to the tables, I hit a bit of a bad luck ...
9
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2answers
804 views

Simple set of equations

Find 4 equations of the form A [OPERATION] B = C, using the numbers 1-4 and operations $+,-,\times,\div$. Each number must be used once for the A's, once for the B'...
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3answers
689 views

Math number puzzle/riddle

This not-so-simple puzzle asked by my teacher today, given: $2+2=3$ $4+8=27$ $3+4=8$ So, the answer for: $5+32=?$ I'm new here so pardon my mistakes. Please let me know what you guys thinks ...
5
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4answers
671 views

Sticks and stones may break my sum

13 sticks and two stones are laid out as follows: Move three items so the arrangement makes sense. Only the basic functions ×÷-+= are allowed.
1
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1answer
155 views

Simple probability game [closed]

You are asked to play a classic shell game with two shells. Each round, a ball is placed under one shell, the shells are rapidly, continuously rearranged for 15 seconds with distraction*, and then ...
3
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6answers
39k views

Fill number in missing?

Given options are: A. 13 B. 42 C. 18 D. 30
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2answers
747 views

Find the missing number : [closed]

Find the missing number in the following table. Answer Options are: 25 27 32 30
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1answer
1k views

find the missing number in the following table

Find the missing number in the following table. Answer Options: 10 12 15 16
3
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1answer
558 views

Can you find the pattern?

If the following are true: $4+7+2 = 281435$ $7+3+9 = 212781$ $6+2+7 = 121456$ $2+8+5 = 164036$ Then what would the following equal? $8+4+6\ =\ ?$ Can anybody check my work? I ...
11
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2answers
1k views

Lets see how smart Puzzling' stack users really are!

Let's see how smart Puzzling stack users really are! Try to solve the value of x (get angle value). This is related to the http://thinkzone.wlonk.com/MathFun/Triangle.htm , you can search online how ...
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0answers
50 views

Total number of squares + inside square [duplicate]

How to calculate total number of squares if n×n square box available. Need to calculate 1×1, 2×2 up to n.
5
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1answer
279 views

Try to find the hidden letters!

Try to find the hidden letters! Tips: ▲ 1: (1/2)π^2 2: (2πr) + 2r 3: (2πr) + 4r
7
votes
2answers
855 views

Getting to the Root of the Problem

TD:LR - Only the equations and bold question at the bottom are part of the puzzle; the rest is just flufftext. After a long time of searching for the origin of the device I previously posted about, I ...
18
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5answers
6k views

How to get 5 from 0,0,0 and 1?

Can you use the digits 0,0,0 and 1 each only once in a mathematical expression for the number 5 using only common mathematical symbols with at least 1 mathematical symbol between each number?
2
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4answers
546 views

All locked up and nowhere to turn

While working in your basement, you notice there is a portion of concrete which is not like the rest. It is funny you never noticed it before, but most of the time there was a rug covering it. Tapping ...
9
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2answers
363 views

Looking for another partition of 100

The sum of ten, not necessarily different, positive integers is 100. If placed adequately on the vertices of this graph, two of them will be joined by a line if, and only if, they have a common ...
19
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11answers
4k views

Add parentheses to make this true

Add parentheses to the following to make a true equation: $10-9\times8-7\times6-5\times4-3\times2-2\times1=1$
3
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2answers
393 views

Solve This 'Unknown Operator' Problem

Source If below equations are true, 24 % 6 = 64 35 % 5 = 87 63 % 7 = 99 Then based on similar logic what's the value of below equation ...
15
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2answers
919 views

Buttons on an old non-scientific calculator are less sensitive

All 5 numbers are entered in an ascending order. These numbers are in an arithmetic progression. The value of the fifth number, i.e. the largest number, is less than 99. While adding these ...
25
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1answer
2k views

How many silver marbles does Paul have?

Peter, Paul and Mary have between them 282 marbles. Though of the three friends, it is Peter who has the most marbles, he is the one with the fewest silver marbles, just the square root of the ...
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3answers
4k views

Can you find the missing number in this grid?

Can you find the missing number?
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2answers
1k views

A mystery partition of 100

Given a multiset (a set with repeated elements allowed) of positive integers, its P-graph is the loopless graph whose vertex set consists of those integers, any two of which are joined by an edge if ...
10
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1answer
483 views

Labelling a graph with a partition of 100

Label the vertices of this graph with positive integers (repetitions allowed) whose sum is 100 in such a way that any pair of vertices are joined by an edge if (and only if) they have labels with a ...
15
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6answers
4k views

Solve this math puzzle using numbers 0-9

The numbers used can only be from 0-9 and can't be used twice. The unused digit needs to be less than 6.
15
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1answer
1k views

Rybo switched the calculator keys!

I'm Dave. In revenge for my calculator key-switching prank, Rybo has performed a similar prank on me! My calculator has the usual number keys, and keys for the usual four arithmetic operations: ...
2
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5answers
940 views

Make 12 with 1, 5, 19, 10

How can you make the number 12 with just the numbers 1,5,19,10? You can only use each number once, and can only use subtraction addition multiplication and division.
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1answer
1k views

How to solve Rubik's Cube using mathematical formulas? [closed]

I am trying to solve Rubik's Cube, but it took one month for me when I started. Are there any mathematical formulas, rules and tips for solving Rubik's Cube in less time (i.e. minutes)?
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0answers
76 views

Alignment of planets that orbit at same speed [closed]

How could I calculate the alignment of 3 planets that orbit around the sun at the same speed? I have this data: P1: Distance from the sun 1000km and angular velocity 1 degree per day. P2: Distance ...
9
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1answer
1k views

Find the missing numbers

Add all of the missing information to complete each set below. In the end, there must be no difference between your answer and mine. ...
6
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7answers
861 views

Making 4 with 4 ones (with a twist!)

This puzzle is all about making 4 with 4 ones, but with certain constraints. Allowed operations: $-$ Subtraction $-a$ Negation $\times$ Multiplication $\div$ Division $\sqrt{a}$ Square Root $\sqrt[b]...
5
votes
1answer
404 views

Ernie and the Mastermind

Recently Ernie's twin niece and nephew Maria and Mario were spending a few days staying at his place. When I dropped in on a rainy Friday morning I found them a little dissatisfied with the ...
27
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4answers
31k views

Create all numbers from 0-100 only using all of 1,2,3,4 and 5

Create all numbers from 0-100 only using 1,2,3,4 and 5. No repeats and you have to use each number. Also, you can use any operation. I've only gotten to 50 by pure brute force. I think that this might ...
10
votes
2answers
810 views

Factoring puzzle

I have an amazing puzzle that should be a little difficult even for you awesome puzzlers. $(ab)^c = def × ghij$ where each letter stands for a number from 0 to 9 (inclusive). Each digit must be ...
2
votes
1answer
180 views

Relation between numbers

Is there a way to find the relation between numbers? I have 2 groups of numbers. Group A ...
11
votes
2answers
386 views

Vending Machines Always Take My Money

While strolling home through the industrial district late one night with a puzzle stuck in your head, you wander off course into an area you’ve never been before. As you turn in the direction you ...
15
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4answers
1k views

February 2017 golf

How many minutes are there in February 2017? This is "puzzling golf". The shortest correct answer wins. PS: The puzzle is not so much to compute the result, but rather to express it in fewer than 5 ...
19
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17answers
9k views

Number 88 from the digits 2, 0, 1 and 7?

Can you use the digits 2, 0, 1 and 7 each only once to create the number 88?
2
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1answer
302 views

Most consecutive positive integers using two 1s

Using two 1s, try to come up with the most consecutive positive integers. Allowed operations: Addition Subtraction Multiplication Division Concatenation Square Root Radical Factorial Floor and ...
33
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5answers
7k views

Rendering the number 10,958 with the string 1 2 3 4 5 6 7 8 9

Brazilian mathematician Inder Taneja has found a way of expressing every number between 1 and 11,111, except 10,958, by inserting mathematical operators in between the numbers 1 2 3 4 5 6 7 8 9 and ...
8
votes
11answers
1k views

Magic Time-travelling Baktun Wheel

I have an ancient mayan friend who emailed me the other day: From: BalajChanKawiil@google.az To: puzzleguy@google.com Subject: Hey! Hey how are you! I was wondering if you were ...
20
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4answers
1k views

The Prison Escape Pt. 1 (THE DOOR)

You are currently escaping a prison owned by a mad scientist. As you were about to approach a large iron door that you think should be leading to the exit, a guard came out from the shadows. ...
3
votes
1answer
289 views

KenKen Zen: The Cluelessening

As our KenKen voyage of cluelessening­* began, some clues remained entirely hidden from us.  Though much remains to be discovered, we may now be entrusted with all clue amounts at once.&...
12
votes
2answers
745 views

Ernie and the unfair division of the dessert

I was pleased to get an invitation to Ernie's place for dinner last Wednesday. The triplets were staying for the week so I knew Ernie would be making an extra effort to cook a gourmet home-cooked ...