NRICH: Nine Colours

If you have 27 small cubes, 3 each of nine colours, can you make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of every colour?

In the picture, the top face and the left face have one of each colour.

Unfortunately the third face has two greens, two blacks, no reds and no browns, so this is not a valid solution.

You might like to explore this problem using cubes. If you don’t have any cubes, you could record your work on squared paper by drawing and colouring each layer, or use the interactivity below.

Age 11 to 16 

Math Topics
Deductive Reasoning & Logical Thinking
Middle School, High School
6th Grade, 7th Grade, 8th Grade, 9th Grade, 10th Grade, 11th Grade

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NRICH (University of Cambridge)

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Online Game

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