Summary
In “Cuboid Castle,” the Numberblocks explore solid 3D shapes and how they differ from flat ones. A full episode (4:45) from the BAFTA-winning maths series — quick to drop into a maths warm-up or centre.
Viewer safety
All ages
Common Sense Media — not yet ratedIMDb Parents Guide — not yet rated
Our rating is a quick teacher-to-teacher guide — preview before showing.
Teaching resources
Discussion questions
Discussion
“Cuboid Castle” helps children explore solid 3D shapes and how they differ from flat ones.
- What solid shapes did the Numberblocks make?
- How is a solid shape different from a flat one?
- Can you find a cube or a box shape near you?
Quick work-a-long
Vocabulary: solid, flat, cube, cuboid, face, 3D.
Try it: Find a solid shape in the room and count its flat faces.

