DAY 75:

Today’s Challenge

Start with the number 13, then follow these ten arithmetic steps:

2     +5     ÷2     ×5     4     ÷9     +1     ×5     1     ÷4     =     ?

What is your final answer?

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The 7puzzle Challenge

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

The 1st & 6th rows contain the following fourteen numbers:

2     5     9     12     14     15     18     20     22     33     40     49     56     72

Which four different numbers, when added together, makes a total of 100?

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Answers

. . . can be found when clicking this.

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DAY 74:

Today’s Challenge

Can you arrive at the target answer of 24 by using each of the digits 3, 3, 3 and 5 exactly once each, and with + – × ÷ available?

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The 7puzzle Challenge

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

The 1st & 6th rows contain the following fourteen numbers:

2     5     9     12     14     15     18     20     22     33     40     49     56     72

Which three numbers, when each is multiplied by 4, have their answers on the list?

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Answers

. . . can be found when clicking this.

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DAY 73:

Today’s Challenge

As well as 9+4+1, there are SEVEN other ways of making 14 when adding together three unique digits from 1-9.  List these seven combinations.

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The 7puzzle Number Challenge

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

The 1st & 6th rows contain the following fourteen numbers:

2     5     9     12     14     15     18     20     22     33     40     49     56     72

What is the sum of the multiples of 6?

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Answers

. . . can be found when clicking this.

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DAY 72:

Today’s Challenge

From the numbers 1 to 20 inclusive, find the only one that remains when you eliminate all square numbers, multiples of 6, factors of 40 and odd numbers.

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The 7puzzle Challenge

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

The 1st & 6th rows contain the following fourteen numbers:

2     5     9     12     14     15     18     20     22     33     40     49     56     72

How many square numbers are present?

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Answers

. . . can be found when clicking this.

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DAY 71:

Today’s Challenge

Start at the number 100 and keep on subtracting 7 until the answer is a single-digit number.  What is this single-digit number?

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The 7puzzle Challenge

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

The 1st & 6th rows contain the following fourteen numbers:

2     5     9     12     14     15     18     20     22     33     40     49     56     72

Which number is the sum of three different numbers also on the list?

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Answers

. . . can be found when clicking this.

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DAY 70:

Today’s Challenge

Using the numbers 1, 4 and 6 once each with + – × ÷ available, list the SIX numbers that are mathematically possible to make in the range 20-30 inclusive.

Details of our Mathematically Possible game is at mathematicallypossible.com.

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The 7puzzle Challenge

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

The 3rd & 5th rows contain the following fourteen numbers:

6     7     13     16     21     25     36     42     45     50     66     80     81     84

What is the sum of the factors of 100?

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Answers

. . . can be found when clicking this.

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DAY 69:

Today’s Challenge

If the number sequence 5, 9, 13, 17, 21 . . . is continued, which is the only number from the following list that will appear later in the sequence?

35     43     59     67     71     85     95

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The 7puzzle Challenge

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

The 3rd & 5th rows contain the following fourteen numbers:

6     7     13     16     21     25     36     42     45     50     66     80     81     84

Is the sum of the even numbers more than double the sum of the odd numbers?

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Answers

. . . can be found when clicking this.

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DAY 68:

Today’s Challenge

Can you arrive at the target number 105 by using the five numbers 1, 2, 3, 4 and 5 exactly once each, and with + – ×  ÷ available?

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The 7puzzle Challenge

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

The 3rd & 5th rows contain the following fourteen numbers:

6     7     13     16     21     25     36     42     45     50     66     80     81     84

What is the difference between the highest multiple of 8 and highest multiple of 9?

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Answers

. . . can be found when clicking this.

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DAY 67:

  • Today’s Challenge

Can you correctly replace the 12 ◯’s below with 0, 1, 1, 2, 2, 3, 4, 5, 5, 8, 9 and 9?

◯  +  ◯   =    3    =   ◯  –  ◯
◯  +  ◯   =    8    =   ◯  ×  ◯
◯  +  ◯   =    1    =   ◯  ÷  ◯

Click MATHELONA for details on how to purchase our number puzzle pocket book.

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The 7puzzle Challenge

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

The 3rd & 5th rows contain the following fourteen numbers:

6     7     13     16     21     25     36     42     45     50     66     80     81     84

Which two numbers have a difference of 25?

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Answers

. . . can be found when clicking this.

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DAY 66:

Today’s Challenge

Multiply two numbers together and then add or subtract a third number to reach the target answer of 60. The three numbers used in each calculation must all be digits from 1-9 and in this challenge they can be repeated.

As an example, one way of making 60 is (9×6)+6, can you find the other THREE ways?

[Note:  (9×6)+6 and (6×9)+6 counts as the same way.]

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The 7puzzle Challenge

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

The 3rd & 5th rows contain the following fourteen numbers:

6     7     13     16     21     25     36     42     45     50     66     80     81     84

How many pairs of consecutive numbers are there?

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Answers

. . . can be found when clicking this.

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