Daily Number Puzzles

the7puzzlecompanyHello and welcome to 7puzzleblog.com - probably the best number puzzle website in the world.

At the 7puzzle company, we produce number puzzles for our many followers from over 140 different countries and territories around the world. Our aim is to help improve people’s basic knowledge and confidence of number and arithmetic in a fun and non-threatening way.

Our bumper compendium of challenges at 7puzzleblog.com will eventually contain 366 number puzzles, one for each day of the year.  They are great preparation for any mathematics test or examination that may be on the horizon.

Click on the dates below to access our number puzzles, we will reply to all answers requested or received.

the7puzzlecompany

Send us your thoughts by leaving a comment at the bottom of each challenge page or by tweeting @7puzzle or alternatively e-mailing us at paul@7puzzle.com.

Enjoy your visit to 7puzzleblog.com and spread the message about our fabulous daily number puzzles to your family, friends, students and colleagues as well as any puzzle enthusiasts you may know.

To find out more about the 7puzzle company, simply click this link.

Paul Godding: Owner, the 7puzzle company

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January/Ionawr/Enero/Janeiro/Janvier/Eanáir/Gennaio

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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February/Chwefror/Febrero/Fevereiro/Février/Feabhra/Febbraio

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29

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March/Mawrth/Marzo/Março/Mars/Márta/Marzo

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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April/Ebrill/Abril/Abril/Avril/Aibreán/Aprile

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30

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May/Mai/Mayo/Maio/Mai/Bealtaine/Maggio

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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June/Mehefin/Junio/Junho/Juin/Meitheamh/Guigno

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30

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July/Gorffennaf/Julio/Julho/Juillet/Iúil/Luglio

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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August/Awst/Agosto/Agosto/Août/Lúnasa/Agosto

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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September/Medi/Septiembre/Setembro/Septembre/MeánFómhair/Settembre

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30

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October/Hydref/Octubre/Outubro/Octobre/DeireadhFómhair/Ottobre

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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November/Tachwedd/Noviembre/Novembro/Novembre/Samhain/Novembre

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30

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December/Rhagfyr/Diciembre/Dezembro/Décembre/Nollaig/Dicembre

1        2        3        4        5        6        7

8       9       10       11       12       13       14

15       16       17       18       19       20       21

22       23       24       25       26       27       28

29       30       31

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. . . and there’s more!

In addition to clicking on the dates to access our number puzzles, there are hundreds of other number challenges to be found at 7puzzleblog.com if you delve deeply enough!

Details of the many other educational activities the 7puzzle company is currently involved in can be found by clicking the following links:

The 7puzzle company‘s main objective is to spread the message about the positive impact games & puzzles can have in the classroom.

We do this through our innovative PuzzleFriday concept and recommend all schools to invest in the tried and tested PuzzleFriday Packs of resources.

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

the7puzzlecompany

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DAY 185

In each of our own number puzzles where the target is 7, there will always be at least one number to work with which is decimal.

Your task is to arrive at the target answer of 7 by using each of the numbers 1, 1.5, 2 and 8 exactly once each, with +  × and ÷ available.

There’s also a more difficult way of getting to 7 which involves dipping into negative numbers, can you find it?

MathelonaLogo

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DAY 184

This tends to be popular with both teachers and children, so read the following clues to work out which number I am today:

  • I am a 2-digit number
  • 3 and 4 both divide exactly into me
  • my two digits add up to 9
  • I am not a square number

Who am I?

MathelonaLogo

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DAY 183

You need to know about prime numbers, square numbers and triangular numbers. If you’re not sure, use the trusted Google:

Simply add together the first seven prime numbers, first seven square numbers and first seven triangular numbers. What do these 21 numbers total?

MathelonaLogo

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DAY 182

Your task is to find a way of arriving at the target number of 70 by using each of the five numbers 1, 2, 3, 4 and 5 once only, with +  × and ÷ available.

One way is [(4 × 3) + 2] × 5 × 1 = 70, can you find another?

MathelonaLogo

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DAY 181

This number puzzle is again based on my fun & challenging app, Mathelona, and very similar to a bronze medal challenge.  A bit of logical thinking should get you there.

Can you replace the 12 ?’s below with 0, 1, 1, 2, 3, 4, 5, 5, 6, 7, 9 and 9 so that all three lines work out arithmetically?

?  +  ?    =     4     =    ?  –  ?
?  +  ?    =    18    =    ?  ×  ?
?  +  ?    =     7     =    ?  ÷  ?

To play similar number puzzles to this on your iPhone or iPad, click mathelona.com for details.

MathelonaLogo

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DAY 180

This is a continuation of a number puzzle posted on Day 10 and made famous by French writer, George Perec.

We invite you to use seven 7′s (7, 7, 7, 7, 7, 7 and 7) once each, with + – × and ÷ available, to make all the target numbers from 10 to 19.

For instance, to make 10, you could simply do:

  • 7 + (7÷7) + (7÷7) + (7÷7) = 10.

Show how you can make the remaining target answers from 11-19.

MathelonaLogo

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DAY 179

In this challenge simply multiply two numbers together, then either add or subtract a third number to arrive at your target answer, which today is 60.

Using the formula (a × b) ± c, where a, b and c are digits from 1-9, there are four ways of arriving at the answer of 60. One way is (9 × 6) + 6, but can you find the THREE other ways? A number can be used more than once in a calculation.

[Note:  (9 × 6) + 6 = 60  and  (6 × 9) + 6 = 60  counts as just ONE way]

MathelonaLogo

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DAY 178

A similar challenge to the ones seen when playing the popular American maths card game, 24game, but this question involves trying to get to a different target number:

Can you arrive at the target answer of 7 by using each of the numbers 0.2, 0.5, 2 and 2.5 exactly once each, and with +  × ÷ available?

MathelonaLogo

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