Category Archives: 7puzzleblog.com

DAY/DYDD/GIORNO/NAP 192:

The Main Challenge This is a number puzzle taken from my scrapbook of brainteasers, a favourite of mine, and used regularly as a mental maths starter in my workshops over the years! You have a 6-sector dartboard containing the numbers … Continue reading

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DAY/DYDD/GIORNO/NAP 191:

The Main Challenge This is a very special challenge personally endorsed by Robert Sun, inventor of the world-famous maths card game, 24game®. The idea is very simple; make 24 from the card below by using the four numbers exactly once … Continue reading

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DAY/DYDD/GIORNO/NAP 190:

The Main Challenge This is the 3rd, and final, part of a number puzzle posted initially on DAY 10, then on DAY 180, and made famous by French writer, George Perec. The challenge involves using seven 7′s (7 7 7 7 7 … Continue reading

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DAY/DYDD/GIORNO/NAP 189:

The Main Challenge Can you insert the numbers 1-9, exactly once each, into the gaps below so that all three lines work out arithmetically? ◯   +   ◯   =   ◯ ◯   –   ◯   =   … Continue reading

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DAY/DYDD/GIORNO/NAP 188:

The Main Challenge Try the following number challenge similar to the ones found in our Mathelona pocket book of challenges. Click the link for details. Your task is to make all four lines below work arithmetically by placing the following 16 digits into the … Continue reading

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DAY/DYDD/GIORNO/NAP 187:

The Main Challenge A Keith Number, made famous by Mike Keith, is worked out in a not-too-dissimilar way to Fibonacci Numbers. If you like playing around with numbers, have a go at this fun concept.  The first 2-digit Keith Number, 14, … Continue reading

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DAY/DYDD/GIORNO/NAP 186:

The Main Challenge Here’s another 10-step question involving all four arithmetic operations and all numbers from 1 to 10. Start with the number 28, then: divide by four multiply by six subtract two add five divide by nine multiply by one … Continue reading

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DAY/DYDD/GIORNO/NAP 185:

The Main Challenge Your task is to arrive at the target answer of 7 when using each of the numbers 0.7, 2, 7 and 10 exactly once each, with + – × ÷ available. The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

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DAY/DYDD/GIORNO/NAP 184:

The Main Challenge Read the following clues to work out which number I am today:  I am a 2-digit number,  Both 3 and 4 divide exactly into me,  My two digits add up to 9,  I am not a square … Continue reading

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DAY/DYDD/GIORNO/NAP 183:

The Main Challenge Simply add together the first seven square numbers and the first seven prime numbers. What is the total of these 14 numbers? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging … Continue reading

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