Author Archives: 7puzzle

DAY 269:

The Main Challenge There is just one set of three consecutive numbers in ascending order whose sum is less than 50 and follow this sequence:  square number – triangular number – prime number Can you list this set of three … Continue reading

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WELCOME

A warm Welsh ‘Croeso’ to 7puzzleblog.com and our compendium of daily number puzzles. Five challenges are posted each day, 7 days a week. These are designed for our many followers from over 160 countries & territories throughout the world. As well as our ever-expanding … Continue reading

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DAY 268:

The Main Challenge Find the sum of the SEVEN different numbers in the range 65 to 85 that are either multiples of 9, 10, 11 or 12. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different … Continue reading

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DAY 267:

The Main Challenge Using all four numbers 1, 5, 5 and 10 once each, with + – × ÷ available in each calculation, which even number from 2 to 20 inclusive is impossible to make? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 … Continue reading

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DAY 266:

The Main Challenge Using the four numbers 2, 4, 7 and 8 once each, with + – × ÷ available, show how you can make the following six target numbers: 8     18     28     38     48     58 The 7puzzle Challenge The … Continue reading

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DAY 265:

The Main Challenge . . . is a typical challenge from the excellent American maths card game, 24game®. Using the four numbers 2, 4, 4 and 9 once each, with + – × ÷ available, can you arrive at the target number of … Continue reading

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DAY 264:

The Main Challenge Your task is to make the four lines below work out arithmetically. Simply place the digits 0 to 9 into the 16 gaps, but each digit must only be inserted a maximum of twice in the whole challenge. … Continue reading

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DAY 263:

The Main Challenge One of our popular Mathelona challenges awaits you; can you complete this by making all four lines work out arithmetically?  Fill the 16 gaps with digits 0 to 9, but each digit can only be inserted a maximum of … Continue reading

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DAY 262:

The Main Challenge Read the following facts to work out my numerical value:  I am a 3-digit number less than 200  I am a multiple of 11  Add 4 to me and I become a multiple of 5  All my … Continue reading

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DAY 261:

The Main Challenge Your task is to make all four lines below work out arithmetically by placing digits from 0 to 9 into the 16 gaps, but each digit can only be used a maximum of twice! Can you complete this Mathelona challenge? … Continue reading

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