Category Archives: 7puzzleblog.com

DAY/DYDD/GIORNO/NAP 29:

The Main Challenge What is the 7th 2-digit whole number that is both a multiple of 5 AND contains the letter ‘F’ when written in English? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different … Continue reading

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DAY/DYDD/GIORNO/NAP 28:

The Main Challenge Here is an introductory Mathelona challenge taken from the front cover of Volume 1 of my pocket book series. ◯  +  ◯   =    3    =   ◯  –  ◯ ◯  +  ◯   =   … Continue reading

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DAY/DYDD/GIORNO/NAP 27:

The Main Challenge Using each of the numbers 2, 2 and 5 exactly once each, with + – × ÷ available, can you find all NINE numbers from 1-20 that are mathematically possible to make? The 7puzzle Challenge The playing board of the … Continue reading

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DAY/DYDD/GIORNO/NAP 26:

The Main Challenge From the numbers 50-100 inclusive, eliminate all multiples of 5, prime numbers, even numbers and multiples of 3. What is the sum of the two numbers that remain? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

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DAY/DYDD/GIORNO/NAP 25:

The Main Challenge One simple rule – multiply two numbers together, then either add or subtract the third number to achieve your target number of 10.  The three numbers used in each calculation must be unique digits from 2-9. As … Continue reading

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DAY/DYDD/GIORNO/NAP 24:

The Main Challenge Can you arrive at the target answer of 24 by using each of the four numbers 1, 7, 13 and 13 exactly once each, and with + – × ÷ available? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

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DAY/DYDD/GIORNO/NAP 23:

The Main Challenge To solve this Octaplus puzzle, find the values of eight letters, A to H, from the given clues. Each letter contains a different whole number in the range 1-50:  B minus E is either 14 or 15,  C … Continue reading

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DAY/DYDD/GIORNO/NAP 22:

The Main Challenge . . . is a Kakuro-type puzzle.  As well as 9321 (or 9+3+2+1), there are FIVE other ways of combining and adding together four unique digits from 1-9 to make 15.  Can you list those five ways? The 7puzzle … Continue reading

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DAY/DYDD/GIORNO/NAP 21:

The Main Challenge Which is the lowest whole number that is NOT a multiple of 4, 5 or 6, nor a prime number, square number or cube number? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing … Continue reading

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DAY/DYDD/GIORNO/NAP 20:

The Main Challenge Consider all whole numbers from 1 to 60, then delete the following:  all prime numbers,  … and any number that differs by 1 from a prime,  all square numbers,  … and any number that differs by 1 from a square, … Continue reading

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