Stage: 2 Challenge Level: 
Swap the stars with the moons, using only knights' moves (as on a chess board).
What's the smallest number of moves possible? (Only once piece can occupy a single square at a time.)
Addition & subtraction. Compound transformations. Multiplication & division. Combinations. Visualising. Practical Activity. Interactivities. Recording mathematics. Investigations. Working systematically.
Published April 2000.
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