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Questions tagged [calculation-puzzle]

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

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Arrange numbers into the quadrilaterals

Arrange numbers 1 to 14 to the quadrilaterals, such that: The difference between 2 numbers in squares having a common edge or corner is greater than 2. Numbers inside the green quadrilaterals are ...
1k views

Gumball Machine Logic Math Puzzle

You walk into an antique shop and find an unusual gumball machine. On the back of the gumball machine you can set and lock five dials with the following labels: Percentage (0% through 100%) Pink (0 ...
217 views

Generate a valid string

I have been observing her for just over a week now. She had seen me but didn't know she was being watched. As people pass she hands them a piece of paper. Some even stop and put money in a cigar box ...
250 views

805 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'...
701 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 ...
674 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.
157 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 ...
44k views

Fill number in missing?

Given options are: A. 13 B. 42 C. 18 D. 30
766 views

Find the missing number : [closed]

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

find the missing number in the following table

Find the missing number in the following table. Answer Options: 10 12 15 16
575 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 ...
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 ...
52 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.
280 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
857 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 ...
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?
548 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 ...
365 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 ...
4k views

Add parentheses to make this true

Add parentheses to the following to make a true equation: $10-9\times8-7\times6-5\times4-3\times2-2\times1=1$
421 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 ...
921 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 ...
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 ...
4k views

Can you find the missing number in this grid?

Can you find the missing number?
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 ...
492 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 ...
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.
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: ...