Daily Number Puzzles

the7puzzlecompanyWelcome 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 213

This number puzzle can be solved by repeated subtraction.

Start at 180 and subtract 7.  Continue doing this until your answer is a single-digit number. What is this number?

MathelonaLogo

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DAY 212

This type of calculation is carried out when playing my popular arithmetic and strategy board game, the possible game. Full details of the game can be found at mathematicallypossible.com.

Using the numbers 2, 3 and 3 once each, and with + – × ÷ available, which ELEVEN target answers from 1 to 18 are mathematically possible to achieve?

MathelonaLogo

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DAY 211

As well as 9+4+2+1, can you list the SEVEN other ways of making 16 when adding together 4 unique digits from 1 to 9?

MathelonaLogo

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DAY 210

Try the following Mathelona-type challenge, similar to my app but slightly tougher!  Further details of the app can be found by clicking on Mathelona.

Your task is to make all four lines work out arithmetically by replacing the 16 ?’s below with the following digits:

0    0    1    1    2    2    3    3    4    4    5    6    6    7    8    9

Can you achieve it?

?   +   ?    =     8     =    ?   +   ?
?   +   ?    =     7     =    ?   –   ?
?   +   ?    =     6     =    ?   ×   ?
?   +   ?    =     4     =     ?   ÷   ?

MathelonaLogo

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DAY 209

This particular number puzzle is very famous in Japan, having been used as part of a TV advert for Google’s Nexus 7 tablet.  Click this YouTube link for a browse.

Using the numbers 1, 1, 5 and 8 exactly once each, with + – × and ÷ available, your task is to arrive at the target number of 10.

Can you beat this tricky Japanese challenge by making 10?

MathelonaLogo

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DAY 208

This puzzle invites you to use seven 2′s (2, 2, 2, 2, 2, 2 and 2) with + – × and ÷ available.

For instance, to make 1 and 2, you could simply do:

  • 2 + (2÷2)  (2÷2)  (2÷2)  =  1
  • 2 + 2 + 2 + 2  2  2  2  =  2

but the question is, what’s the lowest whole number it is NOT possible to make when using the seven 2′s as above?

MathelonaLogo

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DAY 207

Find the sum of the first seven 3-digit numbers that do not contain a 0, 1 or 2 as part of their number. What is your total?

MathelonaLogo

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DAY 206

Study the seven clues below and place the numbers 1-9 into the nine positions. Each number should appear exactly once:

x              x              x

x              x              x

x              x              x

Clues:

  1. The 8 is next to, and directly right of, the 9
  2. The 9 is next to, and directly above, the 6
  3. The 6 is next to, and directly right of, the 4
  4. The 4 is higher than the 1
  5. The 1 is further right of the 3
  6. The 3 is lower than the 7
  7. The 7 is next to, and directly above, the 5

MathelonaLogo

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