Category Archives: 7puzzleblog.com

day/dydd 301 at 7puzzleblog.com

The Main Challenge This number trail contains ten arithmetical steps. Start with the number 40, then:  subtract twenty-six  ÷7  ×10  30% of this  multiply by 3  two-thirds of this  ×12  double it  add fifteen  ÷3 What is your final answer? The 7puzzle … Continue reading

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day/dydd 300 at 7puzzleblog.com

The Main Challenge Here’s a Mathelona challenge for you to try based on the ones found in my pocket book, details of which can be found by clicking Mathelona. You must make all four lines work out arithmetically by filling the 16 gaps with … Continue reading

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day/dydd 299 at 7puzzleblog.com

The Main Challenge Which is the only 2-digit number to have exactly SEVEN factors? . . . and an additional challenge for the number puzzle enthusiast; which is the only 3-digit number to have exactly SEVEN factors? The 7puzzle Challenge … Continue reading

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day/dydd 298 at 7puzzleblog.com

The Main Challenge Read the following facts and work out which number I am today:  I am a 2-digit number,  One of my digits is odd, the other is even,  I have six factors,  I am a multiple of 5 … Continue reading

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day/dydd 297 at 7puzzleblog.com

The Main Challenge This is a typical number puzzle from fellow designer, Kojiro Tominga, who is based in Yokohama, Japan. Using 5, 5, 5 and 5, with + – × ÷ available, can you make each of the target numbers 5, 10, 15, 20, … Continue reading

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day/dydd 296 at 7puzzleblog.com

The Main Challenge Using any five numbers from 1-5 (more than once each if required) and with + – × ÷ available, can you find THREE different ways to make the target number 86? The 7puzzle Challenge The playing board of the … Continue reading

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day/dydd 295 at 7puzzleblog.com

The Main Challenge . . . is from Volume 1 of our Mathelona pocket book. You have a limited amount of numbers to work with, so can you make all three lines work out arithmetically by filling the 12 gaps with these numbers? 1  … Continue reading

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day/dydd 294 at 7puzzleblog.com

The Main Challenge This Banana & Clock Puzzle caused quite a stir and promoted lots of discussion on twitter last year: What do you think the answer on the final line is? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading

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day/dydd 293 at 7puzzleblog.com

The Main Challenge Here is a FlagMath-style puzzle derived from our series of card games. Each of the eleven letters, A-K, in the two sections below contains a percentage calculation. Which is the only letter to have the SAME answer in … Continue reading

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day/dydd 292 at 7puzzleblog.com

The Main Challenge Following on from DAY 240, here’s another one of the unique Keith Number challenges made famous by Mike Keith and similar to the Fibonacci sequence. If you like playing around with numbers, you’ll love having a go at this … Continue reading

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