DAY 18:

Today’s Challenge

All nine numbers from 21 to 29 inclusive must be allocated to a letter below so that each allocated number satisfies the condition given on the line:

  •  (a)  even number,
  •  (b)  factor of 144,
  •  (c)  power of 3,
  •  (d)  prime number,
  •  (e)  digits which differ by 1,
  •  (f)  exactly 3 factors,
  •  (g)  multiple of 7,
  •  (h)  equal to the sum of all its factors (except the number itself),
  •  (i)   2nd digit is greater than its 1st digit.

Remember, the numbers 21 to 29 should only appear once each.

The 7puzzle Challenge

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

The 1st & 7th rows of the playing board contain the following fourteen numbers:

2   4   9   11   14   15   22   24   27   30   40   70   72   77

Which odd number, when 21 is added to it, becomes a square number?

Make 18 Challenge

Can you arrive at 18 by inserting 2, 3, 4 and 6 into the gaps on each line?

  •  ◯×◯–◯×◯ = 18
  •  ◯÷◯×◯×◯² = 18
  •  (◯÷◯)³×√◯÷◯ = 18

Answers can be found here.

Click Paul Godding for details of online maths tuition. Wherever you are in the world, please get in touch.

This entry was posted in 7puzzleblog.com. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *