# Questions tagged [calculation-puzzle]

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

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1answer
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### How to approach “pattern finding ” questions?

I've seen a lot of these types of puzzles in IQ tests, quizzes of various sorts, and I have never been able to figure out how to solve them. These generally involve two or more sets of geometrical ...
1answer
689 views

### Decrypt this Cryptogram: cs.aoa.daso

The encrypted text is: (. is a letter separator and <br> or line break is a word separator) cs.aoa.dasocs.fsi.rxhgs.al....
4answers
475 views

### What is the solution of the last operation?

Each symbol represents a number between 0 and 9. You need found the number which is the solution to the last operation. The two triangles in the first operation and the triangle and the rectangle of ...
1answer
1k views

### The puzzle is to decrypt this encrypted text. (Cryptograms)

The Encrypted text is: 7q7f 93d4 6s03 8aua 3pn9 73wu 9l2l a1wx 8u52 9tld 6fhc axfx 8kn4 628q 4abk 314d 255s 5o5b 9cc1 5904 4sja aa1r 7fai apsw 80ph ai09 ejbs I am currently (at the time of posting ...
2answers
462 views

### Finish The Pattern #3 [closed]

Given this pattern: 0, 1, 0, 2, 2, 2, 3, 4, 5, 6, 6, $n$ Find the next item at $n$ Pattern/sequence explanation required
1answer
1k views

### Finish The Pattern #2

Given a pattern: 0, 1, 2, 0.5, 2, 3, 5, 1, 2, 0, 2, 1, 4, 2, 3, $n$ Find the next item at $n$. Pattern/sequence explanation required
1answer
2k views

### Finish The Pattern #1 [closed]

Given a pattern: 12, 22, 35, 68, 15, 28, 31, $n$ Find the next item at $n$. Pattern/sequence explanation required
2answers
1k views

### What is the maximum number of cities that can be destroyed?

As a commander of an army battalion, you have to plan the attack on some enemy cities which are connected by road-network. Before starting the attack, you have information about all the cities and ...
1answer
2k views

### Calculating row number and column number [closed]

What I am trying to do is calculate the row and column of which an id is in. For example I have the grid 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 As you ...
5answers
1k views

### The game of Sevens

There is a popular game, named Four fours, where you have to find the shortest mathematical expression for every number from $1$ to $n$, using only the number $4$ and some operators. My variant of ...
1answer
1k views

### A Quote from what Movie?

Heads up: It's possible to solve this puzzle without writing computer code, but it is intended to be solved with computer help. This is a 2-stage puzzle. Stage 1: Calculation Puzzle Rules: 1. You ...
1answer
250 views

### How Much Bread For Her Budget? [closed]

A woman is looking through a store and sees a sign for 2 dollar bread saying "For every 10 loaves you buy, you get each for only 1.9 dollars!" A pretty strange deal, but she decides to take it. If ...
2answers
265 views

### What is my room?

You are heading to your hotel room but forget your room number. Try to check the key card but the digits are blurred You call to hotel desk info and a nerdy bell boy tell you: Your room have 4 ...
13answers
11k views

### Making π from 1 2 3 4 5 6 7 8 9

There have been two other questions here and here that are similar to this one, but this changes the rules up a little. Your job is to approximate $\pi$ using the sequence of digits (in order): 1 2 ...
2answers
461 views

### Bitwise multiplication

Mr. EG has come up with a great coding scheme for (non-negative) integers in binary. To show off his creation, he demonstrates the following multiplications: ...
12answers
263k views

### 1 2 3 4 5 6 7 8 9 = 1

This question inspired me to write the same puzzle but instead replace the "= 100" with "= 1" with similar requirements and restrictions. What is the expression with the fewest number of operators ...
1answer
2k views

### How many would die after E slightly pushes the structure in front of him? [closed]

As you can see in the picture, there are 5 people A, B, C, D, E. E is going to slightly push the circular structure so that the initial velocity of the structure on the inclined plane would be zero. ...
10answers
142k views

### 1 2 3 4 5 6 7 8 9 = 100

The sequence of numbers $1\ 2\ 3\ 4\ 5\ 6\ 7\ 8\ 9$ has the property that you can insert mathematical operators in between the numbers from $1$ to $9$ and make the expression evaluate to 100. For ...
4answers
1k views

### A number and its square

Find a four-digit number which is equal to the four least significant (rightmost) digits of its own square.
3answers
2k views

### A self-referring number

Find a ten-digit number with the number of zeros in it as the most significant (leftmost) digit, the number of ones as the second most significant digit etc.
3answers
5k views

3answers
1k views

### 3x3 “Magic Square” of Prime Numbers — Part II

Glad to know the previous puzzle, which was the first puzzle I posted in Puzzling, was warmly welcomed (Thank you!), and an optimal solution was found. Inspired by the comments there, here is the ...
1answer
390 views

### What will be the price of the dog? [closed]

Two men had a certain number of camels, and sold those camels. The price of each camel was equal to the total number of camels they owned initially. They then bought a certain number of goats for that ...
6answers
6k views

### 3x3 “Magic Square” of Prime Numbers

During the thinking and analysis of some mathematical problems, I came up with this puzzle: Just like any magic square, one has to fill in $9$ different numbers $P_1, P_2, \dots P_9$ to a $3 \times 3$...
3answers
745 views

### Replace each ? in the expression with a digit or operator

In the following expression, replace each ? with either a digit or an operator: 8?5+??5-9?+3 so that it can evaluate to: <...
2answers
2k views

### What is the next term in the sequence?

The first term is f(0), the last term is f(2000): 0,0,0,0,1,0,1,0,2,1,1,0,2,0,1,1,3,0,2,0,2,1,1,0,3,1,1,2,2,0,2,0,4,1,1,1,3,0,1,1,5,0,2,0,2,2,1,0,4,1,2,1,2,0,3,1,5,1,1,0,3,0,1,2,6,1,2,0,2,1,2,0,4,0,1,...
1answer
657 views

3answers
6k views

### Where is Jennifer's husband?

Jennifer is 21 years older than her son Douglas. 6 years from now, Jennifer will be 5 times as old as Douglas. Question: Where is Jennifer's husband most likely to be right now?
6answers
2k views

### Alignment of planets that orbit at different speeds [closed]

If a planet completes its circle around the sun in 120 years and another planet in 70 years then when will they come in a straight line as if they are now?