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.

Click the link for details of our Mathematically Possible board game.

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?

Make 70 Challenge

Can you arrive at 70 by inserting 2, 5, 6 and 10 into the gaps on each line?

  •  ◯×◯+◯× = 70
  •  ◯×◯+◯×◯² = 70
  •  (◯+◯)×–double◯ = 70

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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