Why do this problem?
is is very good as a spatial challenge. Some pupils who are not high-achieving in number work may excel in spatial work and this gives them that opportunity.
You can lead up to this challenge by starting with a cube using two colours first. Having plenty of interlocking cubes available for children to try out their ideas will be essential.
How could you start the cube?
Is there only one way of doing it?
Have you all got the same solution?
Are some of the solutions similar?