Welcome

At 7puzzleblog.com, we produce daily number puzzles for our many followers from all corners of the globe (see our visitors map immediately on the right). Our aim is to help improve basic knowledge and confidence of number & arithmetic in a fun way.

Please enjoy your visit and spread the message about our fabulous number puzzles at 7puzzleblog.com. Have a go at our latest golf-related challenge below, #29. Also, why not visit twitter, follow my tweets and contact me @7puzzle?

Click this link if you wish to find out more about our main school-based maths workshops, the 7puzzle experience.

Paul Godding, Director of the 7puzzle company

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#29

There were 72 golfers taking part in the final day of a tournament. There was an 11-minute gap between each pair’s official starting time from the 1st tee. The first group teed off at 8.25am, what time did the last group tee off?

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#28

Insert + – x or ÷ where you see ? so the answer to the following 10-number calculation will equal 83 when working from Left to Right, one step at a time. In this case, do not apply BODMAS/BIDMAS/PEMDAS, so there are no brackets allowed:

1  ?  2  ?  3  ?  4  ?  5  ?  6  ?  7  ?  8  ?  9  ?  10  =  83

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#27

Try and arrive at the target answer of 24 by using each of the numbers 2 4 7 and 8 exactly once each, and with + – x and ÷ available.

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#26

From the numbers 50-100 inclusive, eliminate:

  • multiples of 5
  • prime numbers
  • even numbers
  • multiples of 3

There will be two numbers remaining – what is their sum?

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#25

The formula for this teaser is always the same – multiply two numbers together, then either add or subtract the third number to achieve your target, (a x b) ± c.

Your task is to arrive at the target of 10, where a b c are three unique digits from 2-9. Apart from (4×3)-2, list the other FIVE ways of making 10 when keeping to the above rules.

[NB. (4x3)-2=10 and (3x4)-2=10 counts as just ONE way]

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#24

Try and arrive at the target answer of 24 by using each of the numbers 1 7 13 and 13 exactly once each, and with + – x and ÷ available.

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#23

Try and arrive at the target answer of 24 by using each of the numbers 2 4 4 and 5 exactly once each, and with + – x and ÷ available.

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#22

Three different numbers from the following list add up to 105, but which ones?

15   16   18   20   25   27   28   31   36   37   39   47

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#21

Your task is to make a list of integers, in ascending order, that does not contain any multiples of 4, 5 or 6, nor any prime numbers, square numbers or cube numbers. What is the 7th number in your list?

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