Monthly Archives: January 2018

DAY 31:

Today’s Challenge . . . is to arrive at the target number of 20 by adding together five numbers.  You are limited to using digits 1 to 5 but these can be used any number of times in each calculation. One … Continue reading

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DAY 30:

Today’s Challenge When listing the first seven whole numbers, above 20, that are not multiples of 3, 5 or 7 or do not contain a 3, 5 or 7 as part of their number, what is the 7th number in … Continue reading

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DAY 29:

Today’s 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 numbers, … Continue reading

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DAY 28:

Today’s Challenge . . . is an introductory MATHELONA challenge taken from the cover of Volume 1 of my pocket book series. Can you insert the digits 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5 and 6 into the … Continue reading

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DAY 27:

Today’s 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 7puzzle … Continue reading

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DAY 26:

Today’s 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 a … Continue reading

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DAY 25:

Today’s 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 an … Continue reading

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DAY 24:

Today’s 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 23:

Today’s 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 is … Continue reading

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DAY 22:

Today’s Challenge . . . is a Kakuro-type puzzle.  Apart from 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 Challenge … Continue reading

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