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Non-Manipulative Puzzles / |
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Nine Digits |
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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 |
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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 |
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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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A Star of Numbers |
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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 |
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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 |
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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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Cube Dates |
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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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Divisible By 7 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 behid those
words. |
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The "Twenty-Six" Puzzle |
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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 |
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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 |
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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 |
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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 |
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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 |
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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: July 26, 2008 |
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