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Cube Dates
Cube Dates
after Martin Gardner
It is said that two cubes with twelve digits on their faces are enough to produce any date of year from them. Can you discover how the digits should be placed on the cubes?
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Simple Division
Simple Division
by Ali Kılıç
Move one number to get the correct equation.
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Exchange Puzzles
Exchange Puzzles
by Hasan Yurtoğlu
In each puzzle, which two tiles should be swapped to get the correct equation?
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Number Fit
Number Fit
by Ali Kılıç
Put all the eleven pieces into the 5x5 board so that each row, column, and main diagonal (both diagonals are highlighted) contains different digits, 1 through 5. No piece is rotated or flipped, and no pieces overlap each other.
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Circle Division
Circle Division
by Hasan Yurtoğlu
With three straight lines divide the circle into several regions with equal sums of their numbers. Lines should begin and end on the circle’s periphery. They may cross each other, but not the numbers. No empty regions are allowed.
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Number Flower
Number Flower
by Hasan Yurtoğlu
Fully fill in the flower with missing numbers so that parts of the same color and each complete circle contain all numbers, 1 through 6.
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26 - 63 = 1
26 - 63 = 1
by Mel Stover
In a simple but wrong equation change the position of only one digit so that to make it correct.
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Nob's Dozen
Nob's Dozen
by Nob Yoshigahara
Dividing the grid, adding the numbers, comparing the results. One more brilliant brainteaser coming from the great Nob Yoshigahara's puzzle legacy.
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Nob's Number Tree
Nob's Number Tree
by Nob Yoshigahara
This is a puzzling number tree in which when you already think the solution is in your pocket you suddenly realize it slipped out because of a "tiny digital typo". Don't believe? Just give it a try!
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Simple Multiplication
Simple Multiplication
by Henry E. Dudeney
Some multiplications can be done in an unusual way – by moving a digit from one position to another. This challenge is about the multiplication and... a proper number which such a multiplication should be applied to.
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Nine Digits
Nine Digits
by Henry E. Dudeney
Nine digits are arranged into two groups of two numbers each. When the numbers are multiplied in each group the resulting product is the same. What is the biggest amount which can be created in such groups?
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The Four Sevens
The Four Sevens
by Henry E. Dudeney
We can arrange four 5's to produce one hundred quite easily, using some arithmetical signs. The question is how easy it is to arrange four 7's to obtain the same result?
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Digits in the Square
Digits in the Square
by Henry E. Dudeney
This is a 3x3 square grid where the rows are the most important. Nine different digits to be arranged into three numbers observing a special rule. Take a look at it to see the rule...
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Star of Numbers
Star of Numbers
by Boris Kordemsky
A five-pointed star is made of circular spots held together by wire. Fill in the circles with the correct numbers of stones from 1 through 15 observing some additional rules.
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From 1 Through 19
From 1 Through 19
by Boris Kordemsky
Just write a set of numbers in the circles so that any three of them lying on a straight line always add up to the same total. Is there any algorithm to find the proper solution?
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The Dice Sum
The Dice Sum
by Henry E. Dudeney
A set of four dice, though not marked with spots in the ordinary way, but with digits. When put together a plenty of different four-figure numbers can be formed. How many? And what they all would add up to?
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Divisible By 7
Divisible By 7
after Sam Loyd
Three cubes with three numbers on them should be arranged to create a number divisible by 7. But is there a way to arrange the cubes in order to get the proper number?
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Darts Count
Darts Count
after Martin Gardner
How many darts will you need to toss and which rings with numbers will you need to target in order to score exactly 100? Before scoring this number you can try to score the 50 first.
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The abc Arithmetics
The abc Arithmetics
by Sam Loyd
When 2 is multiplied by 2 it produces the same result as when 2 is added to 2. It is 4 in both cases. Can you think of another pair of numbers with the same arithmetical feature?
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Up to 100
Up to 100
by Henry E. Dudeney and Martin Gardner
Digits 1 through 9 stand in a row in ascending order. Just insert a number of pluses and minuses between them and get 100. And what about the descending order?
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Magic Triangle 3X
Magic Triangle 3X
The six numbers from 1 to 6 have to be placed along the sides of a triangle so that to create some magic sum along each of its sides. What magic sums can be there?
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The 26 Puzzle Re_Solution
The 26 Puzzle Re_Solution
after Professor Louis Hoffman
A sequel to The "Twenty-Six" Puzzle. Numbers 1 through 12 and the magic sum of 26 remain, but the seven areas have changed. Will it be harder than the prequel?
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Twenty4 Puzzle
Twenty4 Puzzle
by Wei-Hwa Huang
It is quite easy to get 24 from an 8 and a 3 - just multiply them together. But discover how incredibly hard this task can be when you have two 8s and two 3s.
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Sum-One
Sum-One
The sum of four ONEs, of course, isn't TEN. That's why the real goal for this calculation is to discover which numbers are hidden behind those words.
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The "Twenty-Six" Puzzle
The "Twenty-Six" Puzzle
after Professor Louis Hoffman
It's a kind of magic square, and you have to place twelve different numbers all around it so that seven regions with the magic sum of twenty six appear.
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Send More Money
Send More Money
by Henry E. Dudeney
Of course, this isn't our appeal! We just want to propose you this great classic cryptarithm that will improve your ability to calculate.
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Six Numbers
Six Numbers
by Martin Gardner
Solving this puzzle you can circle with a feeling that you're one step before your goal or... one step behind. Is there any kind of joke to get exactly on it?
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The Number Grid Puzzle
The Number Grid Puzzle
Don't let the adjacent digits be... adjacent. The eight digits are known, a simple grid is drawn and the systematic approach is recommended.
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The Eight Cards
The Eight Cards
by Henry E. Dudeney
A true classic gem passed through the time. Despite the fact you need just simple arithmetic skills to get to the solution, it will make you be thinking slightly out of the box.
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A Simple Cryptarithm
A Simple Cryptarithm
by Henry E. Dudeney
A "cryptarithm" stands for a puzzle where you have to reveal the hidden numbers to make some calculations correct. Try this simple classic one.
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Last Updated: January 21, 2013 top
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