Author Archives: 7puzzle

DAY 199:

The Main Challenge Follow the rules and only one number will remain. Eliminate the following in the range 1-50:   multiples of 3  square numbers  prime numbers  even numbers Which number from 1-50 will be the last one standing? The 7puzzle … 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 198:

The Main Challenge What is the LOWEST whole number that satisfies all three criteria below? it is the sum of five consecutive whole numbers, it is the sum of two consecutive odd numbers, it is the sum of three consecutive … Continue reading

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DAY 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 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 195:

The Main Challenge In this Kakuro-style question, can you list 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 numbers, … Continue reading

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DAY 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 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 board game can be found at MathPoss.com. Using the numbers 3, 4 and … Continue reading

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DAY 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 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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