DAY 104:

Today’s Challenge

Here’s a selection of mental arithmetic questions.  Can you get all seven correct?

  1.  (10 + 10) – (15 – 3) = ?
  2.  What is the sum of 0.83 and 0.89?
  3.  What is 1 × 9?
  4.  If Ben earns £10 every half-hour, how much will he earn in 40 hours?
  5.  If you burn 100 calories by climbing 100 stairs, how many calories would you burn when climbing 50 stairs?
  6.  What is 5,456 – 4,372?
  7.  Twice my age plus 4 more is 72. How old am I?

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   64   81   84

What is the product of the two prime numbers?

Make 104 Challenge

Can you arrive at 104 by inserting 2, 4, 12 and 15 into the gaps on both lines?

  •  (◯–◯)×(◯–◯) = 104
  •  ◯×(◯+◯)–◯² = 104

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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