Hand a seven-year-old a cube and ask how many faces it has. A good number will say three, and they are not being careless. From any angle, three faces is exactly what you can see. The other three are round the back, and the whole topic turns on getting children to count what is there rather than what is visible. Key Takeaways ● A face is a flat surface, an edge is where two faces meet and a vertex is where edges meet. ● A cube has 6 faces, 12 edges and 8 vertice