Puzzles with Numbers
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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? Play  |  Download
 Simple Division by Ali Kılıç Move one number to get the correct equation. Play  |  Download
 Exchange Puzzles by Hasan Yurtoğlu In each puzzle, which two tiles should be swapped to get the correct equation? Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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! Play  |  Download
 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. Play  |  Download
 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? Play  |  Download
 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? Play  |  Download
 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... Play  |  Download
 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. Play  |  Download
 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? Play  |  Download
 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? Play  |  Download
 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? Play  |  Download
 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. Play  |  Download
 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? Play  |  Download
 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? Play  |  Download
 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? Play  |  Download
 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? Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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? Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 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. Play  |  Download
 Last Updated: January 21, 2013 top
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