At the 7puzzle company, we produce regular number puzzles for our many followers from over 100 different countries. Our aim is to help improve individuals’ basic knowledge and confidence of number & arithmetic in a fun way.
Enjoy your visit and spread the message about the fabulous number puzzles at 7puzzleblog.com. Try our latest challenge, #74, which tests your skills when playing 24game. There are also several hundred number challenges to try at this website.
Click this link if you wish to find out more about our main school-based maths workshops, the 7puzzle experience.
You can also follow me and my tweets on twitter @7puzzle.
Paul Godding, Director of the 7puzzle company
Can you arrive at the target answer of 24 by using each of the digits 3, 3, 3 and 5 exactly once each, and with + – x ÷ available?
As well as 9+4+1, there are seven other ways of making 14 when adding together three unique digits from 1-9. Can you find these seven other combinations?
From the numbers 2-18, find the only one remaining when you eliminate all square numbers, multiples of 6, factors of 40 and odd numbers.
This number puzzle can be solved by repeated subtraction, but is there a quicker way of reaching the answer?
Start at 100 and keep on subtracting 7 until you hit a single-digit number. What is this number?
As when playing the possible game, use the numbers 1, 4 and 6 once each, with + – x ÷ available, to try and find which SIX target numbers it is mathematically possible to achieve, but this time within the range 20-30.
Full details of the possible game can be found at mathematicallypossible.com.
The playing board of the 7puzzle game contains 49 different numbers, ranging from 2 to 84. Keep this in mind when answering the following.
If you wrote down the first SEVEN prime numbers, plus all the multiples of 11 and factors of 24 that could possibly be on the playing board of the 7puzzle game, how many different numbers would be written on your list?
The playing board of the 7puzzle game contains 49 different numbers, ranging from 2 to 84.
If you wrote down all the multiples of 10, factors of 84 and square numbers that could possibly be on the playing board of the 7puzzle game, how many different numbers would be on your list?
Can you replace the 12 ?’s below with 0, 1, 1, 2, 2, 3, 4, 5, 5, 8, 9 and 9:
? + ? = 3 = ? – ?
? + ? = 8 = ? × ?
? + ? = 1 = ? ÷ ?
so that all three lines work out arithmetically? Enjoy!
Insert + – x or ÷ where you see each ? below so the answer to the 7-number calculation will equal 80 when working from Left to Right, one step at a time, with no brackets allowed:
6 ? 2 ? 7 ? 7 ? 3 ? 8 ? 5 = 80