Monthly Archives: July 2019

DAY/DYDD 212:

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 211:

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 210:

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

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DAY/DYDD 209:

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 208:

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

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DAY/DYDD 207:

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 206:

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 205:

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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DAY/DYDD 204:

The Main Challenge Divide these nine numbers into three groups of three so that the sum of each group is the same: 11     25     35     43     51     63     73     85     91 What is … Continue reading

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DAY/DYDD 203:

The Main Challenge Starting with the number 7, complete the following sixteen arithmetic steps: multiply by ten 40 percent of this double it multiply the digits together increase by 20 percent divide by three increase by 50 percent one-third of this double … Continue reading

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