DAY 291:

The Main Challenge

Read the following facts to work out my identity:

  • I am a 2-digit number
  • my two digits have a difference of four
  • add 13 to me and I become a square number

Who am I?

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 2nd & 3rd rows contain the following fourteen numbers:

8   13   17   25   28   36   42   45   48   55   63   64   66   80

What is the difference between the highest and lowest multiples of 5?

The Factors Challenge

Which of the following numbers are factors of 291?

3     5     7     9     11     13     None of them

The Mathematically Possible Challenge

Using 810 and 12 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?

7    14    21    28    35    42    49    56    63    70

#7TimesTable

The Target Challenge

Can you arrive at 291 by inserting 2, 3, 3, 5 and 6 into the gaps below?

  •  ◯×(◯²×(◯+◯)–◯) = 291

Answers can be found here.

Click Paul Godding for details of online maths tuition.

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