DAY 104: | 7puzzle

Today’s Challenge

Here’s a selection of mental arithmetic questions.  Can you get all seven correct?
(10 + 10) – (15 – 3) = ?
What is the sum of 0.83 and 0.89?
What is 1 × 9?
If Ben earns £10 every half-hour, how much will he earn in 40 hours?
If you burn 100 calories by climbing 100 stairs, how many calories do you burn when climbing 50 stairs?
What is 5456 – 4372?
Twice my age plus 4 more is 72. How old am I?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 2nd & 5th rows of the…

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DAY 101: | 7puzzle

Today’s Challenge

Using each of the numbers 0.5, 1, 1.5 and 2 once each, with the four arithmetical operations + – × ÷ available, can you arrive at the target answer of 7?

For the real number puzzle enthusiast, once you have completed the above, can you find a second way of getting to 7?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 2nd & 5th rows of the playing board contain the following fourteen numbers:
6     7     8     16     17     21     28     48     50     55     63    …

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DAY 100: | 7puzzle

Today’s Challenge

Starting from ONE, what is the 7th whole number, when written in English, that does NOT contain the letter ‘E’?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 1st & 3rd rows of the playing board contain the following fourteen numbers:
2     9     13     14     15     22     25     36     40     42     45     66     72     80

List THREE sets of four different numbers that all have a sum of 200.

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Answers
. . . can be found when clicking this.

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DAY 99: | 7puzzle

Today’s Challenge

Read the following ten clues to find the mystery number:
it’s less than 100,
it’s one more than a multiple of 3,
exactly one of its digits is prime,
you get a prime if you reverse its digits,
it’s not a multiple of 5,
it’s not a prime number,
it has exactly four factors,
it’s not a square number,
the sum of its digits is prime,
if you multiply it by 5, the answer is greater than 100.

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 1st & 3rd rows of the playing…

Continue reading at:

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DAY 98: | 7puzzle

Today’s Challenge

There are 2 rules to consider when calculating the NEXT number in our special sequence:
 if it’s EVEN, halve it
 if it’s ODD, add 1

For example, if starting at 50, the sequence would be:
 50    25    26    13    14    7    8    4    2    1

From 50, it takes 9 steps to eventually get down to 1.

Following the above rules, which starting number between 50 and 100 creates the most number of steps, 13 in all, when eventually arriving at 1?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from…

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DAY 114 at 7puzzleblog.com | 7puzzle

Today’s Challenge Can you replace the 12 ?’s below with the 12 numbers 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12 and 13 so that all four lines work out arithmetically? ?    +    ?     =     ? ?    +    ?     =     ? ?    +    ?     =     ? ?    +    ?     =     ? Enjoy this?  Click on this MATHELONA link for details of similar challenges. . Answers . . . can be found when clicking this.  

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