Stage: 2 Challenge Level: 
Arrange nine red cubes, nine blue cubes and nine yellow cubes into a large $3$ by $3$ cube.
No row or column of cubes must contain two cubes of the same colour.
Tangram. Visualising. Investigations. Interactivities. Compound transformations. Combinations. Practical Activity. Interlocking cubes. Addition & subtraction. Working systematically.
Published November 2000.
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