Category Archives: 7puzzleblog.com

DAY/DYDD 46:

The Main Challenge The smallest positive integer that has exactly three factors is FOUR; these are 1, 2 and 4. Find the next integer to have just three factors and the product of these three numbers. The 7puzzle Challenge The playing … Continue reading

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WELCOME/CROESO

A warm Welsh welcome to 7puzzleblog.com and our compendium of daily number puzzles. Five challenges are posted each day, seven days a week, and designed for our many followers from nearly 170 countries & territories throughout the world. As well as our ever-expanding website … Continue reading

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DAY/DYDD 45:

The Main Challenge If you multiply two whole numbers together and then add 4, the result is 40. Which one of the following could NOT be the sum of the two whole numbers you initially multiplied? 12      13  … Continue reading

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DAY/DYDD 44:

The Main Challenge If the number sequence 2, 5, 8, 11, 14 . . . is continued, which is the ONLY number from the following list that will appear later in the sequence? 22   34   43   57   … Continue reading

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DAY/DYDD 43:

The Main Challenge Using the numbers 2, 4 and 6 once each, together with + – × ÷, find the SIX target numbers from the following list that are mathematically possible to make: 12    14    16    18    20  … Continue reading

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DAY/DYDD 42:

The Main Challenge You’ve rolled the numbers 2, 4 and 6 with your three dice.  Using these once each, with + – × ÷ available, find the THREE target numbers from 1-10 that it’s not possible to make. Visit Roll3Dice.com for further details of similar challenges. The 7puzzle … Continue reading

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DAY/DYDD 41:

The Main Challenge When a certain 4-digit number is multiplied by 4, its digits appear in reverse order. It also has both of these properties:  its first digit is a quarter of the last one, and  its second digit is … Continue reading

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DAY/DYDD 40:

The Main Challenge In all four groups below, it is possible to make 24 by using the four numbers once each, with + – × ÷ available. Can you show how to achieve the target number of 24 in each case?    3  … Continue reading

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DAY/DYDD 39:

The Main Challenge By allocating each letter of the English alphabet a numerical value as follows, A=1 B=2 C=3 . . . Z=26, the value of the word CAT would be 24, calculated by doing 3+1+20. Following this rule, what … Continue reading

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DAY/DYDD 38:

The Main Challenge Firstly, allocate each letter of the English alphabet a numerical value as follows, A=1 B=2 C=3 . . . Z=26.  If the value of the word DOG is 26 by calculating 4+15+7, for example, which TWO of … Continue reading

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