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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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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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
by
Boris Kordemsky 

A fivepointed 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 
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 
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 fourfigure numbers
can be formed. How many? And what they all would add up to? 

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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 
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 
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 
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 
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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Twenty4 Puzzle 
by
WeiHwa 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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SumOne 
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 "TwentySix" 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 
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 
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 
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 
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 
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 
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