Welcome

At the 7puzzle company, we produce number puzzles for our many followers from nearly 140 different countries and territories all over the world. Our aim is to help improve the basic knowledge and confidence of number & arithmetic in a fun way.

Enjoy your visit and spread the message about our fabulous daily number puzzles at 7puzzleblog.com.

Scroll down to try some of our recent challenges, including our latest #130 & #131, which will both test your arithmetic and logical skills.  There are over 1,000 other number challenges to try at this website if you delve deep enough!

You can also follow my tweets at @7puzzle or e-mail me at paul@7puzzle.com.

the7puzzlecompany

Paul Godding: Owner, the 7puzzle company

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#131

Due to the popularity of my Mathelona number puzzles, here is an actual Gold Medal challenge from the app.

Replace the 20 ?’s below with the 20 numbers from 0 to 9 (using each exactly twice each) so that all five lines work out arithmetically:

?  +  ?    =    15    =     ?  +  ?
?  +  ?    =     5     =     ?  –  ?
?  +  ?    =    10    =     ?  ×  ?
?  –  ?    =     2     =     ?  ÷  ?
?  +  ?    =     9     =     ?  ×  ?

If you enjoy this puzzle, click this Mathelona link for details of my challenging app.

MathelonaLogo

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#130

Replace the 12 ?’s below with the 12 numbers 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 8 and 10 so that all four lines/equations work out arithmetically:

?   +   ?    =     ?
?   +   ?    =     ?
?   +   ?    =     ?
?   +   ?    =     ?

If you enjoy this type of challenging number puzzle, click on this Mathelona link for details of my challenging app which is very similar to the above – but against the clock!

MathelonaLogo

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#129

Here’s the third ‘Target 7′ question in a row. Can you make 7?

With the four arithmetical operations available, use all four numbers 1, 1.5, 3 and 4 once each in arriving at the target answer of 7.

MathelonaLogo

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#128

Using all four decimal numbers 0.4, 0.8, 1.2 and 3.5 once each, and with + – × ÷ available, your task is to arrive at the target answer of 7.

MathelonaLogo

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#127

With the four arithmetical operations + – × ÷ available, use all four numbers 1, 1.5, 2 and 6 once each when making the target answer of 7.

MathelonaLogo

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#126

Imagine you have just six each of the brand-new 4p and 7p coins (go with it!!).  From 20p upwards, try and make the various amounts with your coins, as shown here:

  • 20p can be made from 5 × 4p coins,
  • 21p from 3 × 7p coins,
  • 22p from 2 × 7p coins and 2 × 4p coins . . .

What is the lowest amount that is impossible to make from your twelve coins?

MathelonaLogo

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#125

The following calculation takes place during every move when playing the possible game. Full details of our popular arithmetic & strategy board game can be found at it’s own dedicated webpage, mathematicallypossible.com.

Using the numbers 3, 4 and 5 just once each, and with + – × ÷ available, only four of the numbers on the list below are possible to achieve. Which ones are they?

1     3     6     9     10     12     15     18     21     24     27     30

MathelonaLogo

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#124

The playing board of the 7puzzle game contains 49 different numbers, the lowest being and the highest 84. There are seven rows, with each row consisting of seven numbers.

The top two rows contain the following numbers:

2   8   9   14   15   17   22   28   40   48   55   63   64   72

Can you find SEVEN different numbers from the above list that total 200? There is more than one solution!

MathelonaLogo

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#123

Follow the rules and eliminate numbers from a given list, until only one remains. From all the numbers 1-30, delete:

  • multiples of 5
  • factors of 36
  • numbers containing a ’7′
  • prime numbers
  • even numbers

What is the only number left?

MathelonaLogo

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