Stage: 3 Challenge Level: 
Use cubes made from smaller cubes (e.g. multilink) to help you. For the 3x3x3 cube, think about "freeing" the centre unit cube.
Games. Working systematically. Interlocking cubes. Visualising. Mathematical reasoning & proof. Generalising. Cubes. Squares. Interactivities. smartphone.
Published February 2003.
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