Martha from Tattingstone School sent us a lovely solution for this. She had obviously worked very hard and done some deep thinking.

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Can you see why the numbers 'swapped around' for the points that Martha has labelled 1, 2 and 3? Can you why the others are all 'four away from the others'? What does Martha mean by 'swapped around' and 'four away from'? Can you think of a clearer way of saying it?