Welcome

At the 7puzzle company, we produce regular number puzzles for our many followers from nearly 100 countries throughout the world. The aim of 7puzzleblog.com is to help improve basic knowledge and confidence of number & arithmetic in a fun way.

Enjoy your visit and spread the message about the fabulous number puzzles at 7puzzleblog.com. Try our latest challenges below, #54 & #55, which together contain ten questions currently doing the rounds on Facebook. There are also several hundred other brainteasers at this site.

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

You can also follow me and my tweets on twitter @7puzzle.

Paul Godding, Director of the 7puzzle company

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#55

This is the 2nd and final part of ‘Can You Pass A Simple Math Test’ containing another five multiple choice questions. The other five are in Challenge #54. Can you achieve 5 out of 5?

1. How many seconds are in 2 hours?

A 8,300     B 7,200     C 3,600     D 9,000

2. Solve (4 x 5) + (7 – 18/3).

A 42     B 74     C 23     D 21

3. What is 235 x 13?

A 3,125     B 3,055     C 3,575

4. If c + d = d, what must c equal?

A 1     B 0.5     C 0

5. Which decimal is equivalent to 3/5?

A 0.35     B 0.53     C 0.6     D 0.3

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#54

This is the 1st part of ‘Can You Pass A Simple Math Test’ containing five multiple choice questions. The other five are in Challenge #55. Can you get 5 out of 5 in this test?

1. Which fraction is greater than 2/3?

A 2/6     B 4/5     C 1/3     D 1/6

2. Susan’s pen is 13/100 of a metre long. What is the length, in metres, of Susan’s pen?

A 0.013     B 1.3     C 1.03     D 0.13

3. What is Pi rounded to 3 decimal places?

A 3.784     B 3.267     C 3.142     D 3.168

4. If 4y = 10/5, what is the value of y?

A 0.5     B 4     C 2     D 1

5. Tom is 1/3 of Joe’s age. David is 1/2 of Joe’s age. Who is the youngest?

A Joe     B Tom     C David

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#53

From the numbers 2, 4, 5, 6, 8, 9, 10, 12, 14, 15, 18, 20, 24  and 25, eliminate the square numbers, triangular numbers, multiples of 4 and factors of 70. There should now be just one number left, what is it?

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#52

What is the lowest 2-digit number that is not:

  • a prime number,
  • a multiple of 3, 4, 5 or 7,
  • a number whose two digits add up to 7 or less.

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#51

Three of the following numbers add up to 57 – but which ones?

11    18    21    22    23    25    26    27    29    33

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#50

Using the numbers 4, 5 and 6 once each, together with + – x and ÷, find the THREE target numbers from the following list that it is NOT possible to make:

2    3    4    5    6    7    10    12    14    15    19    20    26    29    30

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#49

You decide to roll two normal six-sided dice, both containing the numbers 1-6, and then plan to multiply the two numbers showing. How many different possible answers could you obtain?

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#48

What is the greatest integer (whole number) less than 630,000 that can be written using all of the digits from 1 to 6?

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#47

If you multiply a number by 3 and then add 30, the result is the same as if you first added 17 to this number and then multiplied by 2. Is the value of this number 1, 2, 3, 4 or 5?

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