Author Archives: 7puzzle

DAY/DYDD 197:

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:  prime number – cube number – square number What is the sum of these three … Continue reading

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DAY/DYDD 196:

The Main Challenge Here’s a 10-step number trail involving the four arithmetical operations, some 3-digit numbers, plus fractions and percentages. Start with the number 2, then: add three hundred and eighty –292 +106 –50% 1/2 of this multiply by nine 1/3 … Continue reading

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DAY/DYDD 195:

The Main Challenge In this Kakuro-style question, can you list the ONLY way possible to make 16 when adding together five unique digits from 1-9? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different … Continue reading

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DAY/DYDD 194:

The Main Challenge This is similar in style to the challenges found at our popular Mathelona number puzzle pocket book. Click the link for more details. ◯   +   ◯   =   ◯ ◯   +   ◯   = … Continue reading

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DAY/DYDD 193:

The Main Challenge When playing Mathematically Possible, players must analyse which numbers can (or can’t) be made from the three numbers rolled on their dice. Full details of our popular board game can be found at MathPoss.com. Using the numbers 3, 4 … Continue reading

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DAY/DYDD 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 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; to make 24 from the card below by using the four numbers exactly … Continue reading

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DAY/DYDD 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, 7 and … Continue reading

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DAY/DYDD 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 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 16 … Continue reading

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