19 April 2013: MATHELONA SILVER
Try this MATHELONA Silver Medal challenge, taken from my popular app. For further details of the app, including a great review from a Y5 class, click The MATHELONA Games link at the top. Replace the 16...
View Article20 April 2013: OCTAPLUS
When trying to solve the OCTAPLUS puzzle, you must find the values of eight letters, A to H, from the given clues. From the following seven clues, find the values of the letters A to H. Each letter...
View Article24 April 2013: SUBTRACTION
A number puzzle to test your mental arithmetic, particularly those subtracting skills, plus your knowledge of decimal numbers: Start with the number 7, then subtract 0.3, then subtract 0.6 from that...
View Article25 April 2013: COUNTDOWN 333
Try our regular COUNTDOWN-style challenge. All six numbers must be used in this puzzle similar to the numerical challenges seen on the Channel 4 show in the UK: Using the six numbers 4 5 7 25 50 75...
View Article26 April 2013: OCTAPLUS
When trying to solve the OCTAPLUS puzzle, you must find the values of eight letters, A to H, from the given clues. From the following seven clues, find the values of the letters A to H. Each letter...
View Article28 April 2013: THE FLITWITS
Here is another puzzle involving THE FLITWITS, which are a series of digital number puzzles available from this website by clicking on the link above. Many classes in schools are now playing the...
View Article29 April 2013: COUNTDOWN 136
To celebrate the 1st anniversary of 7puzzleblog.com, here is another question that appeared on that very first day: Use the six numbers 5 10 25 50 75 100 exactly once each, with all four operations + –...
View Article5 May 2013: OCTAPLUS
When trying to solve yet another OCTAPLUS puzzle, you must find the values of eight letters, A to H, from the given clues. From the following eight clues, find the values of the letters A to H. Each...
View Article10 May 2013: OCTAPLUS
On #puzzlefriday (see twitter), you must try to solve yet another OCTAPLUS puzzle where the task is to find the values of eight letters, A to H, from the given information. From the following eight...
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17 May 2013: KENKEN
On #puzzlefriday (see twitter), here’s another KENKEN puzzle to try for both old and new fans. Today is a slightly different 5×5 puzzle where all the answers are 10. In the following KENKEN grid, every...
View Article25 May 2013: OCTAPLUS
You must try to solve yet another OCTAPLUS puzzle where the task is to find the values of eight letters, A to H, from the given information. From the following eight clues, find the values of the...
View Article31 May 2013: COUNTDOWN 319
A much harder COUNTDOWN-style challenge for you today. The slight difference to the numerical challenges seen on the Channel 4 show in the UK is that all SIX numbers must be used in this particular...
View Article1 June 2013: THE 49 PUZZLE
Making its first appearance for a few weeks, the 49 PUZZLE is a 7-by-7 grid which has to be filled with all the numbers 1-49. It requires patience and careful thinking, so read the following...
View Article2 June 2013: OCTAPLUS
The final OCTAPLUS puzzle for a while, where your task is to find the values of eight letters, A to H, from the given information. From the following eight clues, find the values of the letters A to H....
View Article14 June 2013: COUNTDOWN 960
Another COUNTDOWN-style challenge for you to try. The slight difference from this to the numerical challenges seen on the Channel 4 show in the UK is that all SIX numbers must be used in this...
View Article22 June 2013: TARGET 7
Here’s another TARGET 7 challenge where at least one decimal number always appears in the question. I predict this is quite a tough one: Using each of the numbers 0.5, 0.8, 1, 5 once each, and with the...
View Article12 July 2013: MAKE 12
It’s the 12th day of July, so use some mental arithmetic to solve four different-sized MAKE puzzles, where 12 is the common target. Replace ? with + – x or ÷ so the results of each of the number...
View Article22 July 2013: KEITH NUMBERS
Following on from yesterday’s challenge, here’s another one of our brand-new number puzzles for this blog, the KEITH NUMBER. This was made famous by Mike Keith and is worked out in a not-too-dissimilar...
View Article1 September 2013: A 4-DIGIT NUMBER
Here’s a tricky one to start the Autumn series: Find the only 4-digit number that has all these properties: its 2nd digit is twice the 1st its 4th digit is three times the 3rd all its digits are...
View Article19 September 2013: TARGET 7
Here’s a tougher TARGET 7 challenge where there are two decimal numbers present, plus two double-digit numbers: Using each of the numbers 0.5, 0.5, 10 and 12 once each, and with the four arithmetical...
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