Category Archives: 7puzzleblog.com

day/dydd/dydh/deiz/día 214 at 7puzzleblog.com

The Main Challenge By using the numbers 4, 5, 7 and 8 exactly once each, and with the four arithmetical operations + – × ÷ available, can you arrive at the target answer of 12 in two different ways? The 7puzzle Challenge The playing board of the … Continue reading

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day/dydd/dydh/deiz/día 213 at 7puzzleblog.com

The Main Challenge You have been given the task of manually numbering a 100-page document from 1 to 100. Which digit will appear most, and how many times? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid … Continue reading

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day/dydd/dydh/deiz/día 212 at 7puzzleblog.com

The Main Challenge Using the numbers 2, 3 and 3 once each, with + – × ÷ available, can you list the ELEVEN target answers from 1-20 that are mathematically possible to achieve? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

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day/dydd/dydh/deiz/día 211 at 7puzzleblog.com

The Main Challenge As well as 9421 (9+4+2+1), list the SEVEN other ways of making 16 when adding together four unique digits from 1 to 9. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 … Continue reading

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day/dydd/dydh/deiz/día 210 at 7puzzleblog.com

The Main Challenge Try the following Mathelona challenge, similar to my pocket book challenges but slightly tougher! Your task is to make all four lines work out arithmetically by placing the 16 digits listed below into the 16 gaps.  Can you  achieve … Continue reading

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day/dydd/dydh/deiz/día 209 at 7puzzleblog.com

The Main Challenge This is very famous in Japan, having been an integral part of a TV advert for Google’s Nexus 7 tablet a few years ago.  Click this YouTube link for a browse. Using the numbers 1, 1, 5 … Continue reading

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day/dydd/dydh/deiz/día 208 at 7puzzleblog.com

The Main Challenge This puzzle invites you to use seven 2’s (2 2 2 2 2 2 and 2), with + – × ÷ available, in each separate calculation. For instance, to make 1 and 2 you could simply do:  2 + (2÷2) – (2÷2) – (2÷2) … Continue reading

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day/dydd/dydh/deiz/día 207 at 7puzzleblog.com

The Main Challenge When listing the first SEVEN 3-digit numbers that do not contain a 0, 1 or 2 as part of their number, what is the total of these listed numbers? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

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day/dydd/dydh/deiz/día 206 at 7puzzleblog.com

The Main Challenge Study the seven clues below and place the numbers 1-9 into the nine positions. Each number should appear exactly once: x              x              x x   … Continue reading

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day/dydd/dydh/deiz/día 205 at 7puzzleblog.com

The Main Challenge Pair the ten numbers below so that the difference between the two numbers in each pair is exactly divisible by 7: 6    17    28    37    45    58    64    78    … Continue reading

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