DAY 107:

Today’s Challenge

Here’s seven tricky mental teasers to try:

  1.  (18 – 5) – (7 – 17) = ?
  2.  128 + 294 = ?
  3.  How many seconds are in a quarter-of-an-hour?
  4.  How many degrees are in three-quarters of a circle?
  5.  (16 – 8) × (13 – 8) = ?
  6.  On four consecutive days, you spend £55, £74, £36 and £15. What is the average amount spent per day?
  7.  What is 15% of £8?

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 & 2nd rows of the playing board contain the following fourteen numbers:

2   8   9   14   15   17   22   28   40   48   55   63   64   72

Which two numbers have a difference of 42?

Make 107 Challenge

Can you arrive at 107 by inserting 9, 10, 11 and 12 into the gaps on both lines?

  •  ◯×◯+◯–◯ = 107   (2 different ways!)
  •  ◯×◯+(◯–◯)³ = 107

Answers can be found here.

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

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