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## 'Take Ten Sticks' printed from http://nrich.maths.org/

This problem is good to encourage systematic thinking - working
from a simple start : twosticks, three, four . . .

Encourage questions like "what could come before . . . . . and
what before that" ?

Working backwards from the goal is a mathematical thinking
skill.

Especially encourage explanation - accounting for pattern.

There is lots of interest in this simple mechanical process -
look out for the triangle numbers!

Above all, if possible, let each insight prompt fresh questions
to consider, each new question will illuminate more of the
structure.