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 #136, which will test your arithmetical skills.  There are over 1,000 other number challenges to try on this page if you delve deeply!

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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#136

You must arrive at the target number 55 by using each of the five numbers 1, 2, 3, 4 and 5 once only, and with + – ×  ÷ available.

There are two different ways – can you find both?

MathelonaLogo

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#135

Another number trail to answer, again involving fourteen arithmetical steps:

Start with the number 2, then:

  • +33
  • divide by seven
  • ×3
  • add twenty percent
  • 50% of this
  • find the square root of this
  • +7
  • 1/2 of this
  • add nineteen
  • ÷6
  • +15
  • ×5
  • –73
  • add seven

What is your final answer?

MathelonaLogo

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#134

From the following six clues, find the values of the letters A to H. Each letter is a different whole number in the range 1-30:

  1. A is one-third of C and one-quarter of G
  2. G is ten lower than H
  3. H is double the value of F, but four lower than B
  4. B is six higher than D
  5. D is double the value of E
  6. the value of E is lower than G.

MathelonaLogo

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#133

A number puzzle to test your subtracting skills and knowledge of prime numbers.

Start at 100 and keep on subtracting consecutive prime numbers (first 2, then 3, followed by 5 . . .) until your answer is a number that’s below 50. What is this number?

MathelonaLogo

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#132

The fourteen arithmetical steps below include some percentage calculations, a big addition and multiplication, plus a square root.

Start with the number 28, then:

  • subtract seventy-five percent
  • +69
  • -4
  • 1/2 of this
  • square root of this
  • ×15
  • multiply by one
  • +80%
  • –10
  • add four hundred and sixty-five
  • subtract forty-five
  • fifty percent of this
  • +231
  • subtract seven

What is your final answer?

MathelonaLogo

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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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