Net Folder

Choose a mode

Press "Fold" to fold the flat net into a 3D shape (it rotates so you can see every side). Count how many faces the solid has, enter the number with − / + or by dragging up, then press Check

3D math game · Best for grades 3-5

Net Folder

Net Folder shows a flat arrangement of polygons — a net — that animates and folds into a 3D solid on screen. Students rotate the result to inspect every face and count them, building the mental link between a flat drawing and the solid it becomes.

What students practice

Visualising how a 2D net folds into a 3D solid develops spatial reasoning and builds the vocabulary of faces, edges, and vertices. This skill underpins later work on surface area and the classification of prisms, pyramids, and polyhedra in grades 3-5.

  1. Examine the flat net: count and name the polygon faces before folding.
  2. Press Fold to watch the net close into a 3D solid.
  3. Rotate the solid using the on-screen controls to see every face, including hidden ones.
  4. Enter the total face count with the −/+ buttons and press Check.

How to use it at home or in class

A cross-shaped net of six squares folds into a cube with 6 faces. A T-shaped net of five squares plus a triangle does not close into any standard solid — the game only presents valid nets, so students can focus on counting after folding rather than on net validity.

Students often miscount faces by counting the same face twice as they rotate, or by missing the base that folds underneath. Systematic rotation — top, front, sides, bottom — and keeping a tally solves both issues.

Use it for individual practice, paired work, or a short class demonstration before worksheets.

Start with the game above, then continue with written practice to reinforce the skill.

Common questions

Which 3D solids appear in the game?
Common curriculum solids: cubes, rectangular prisms, triangular prisms, square pyramids, and triangular pyramids — each with a different net and face count.
Which grades is this game for?
It suits grades 3-5, when students study 3D shapes, their properties, and the relationship between nets and solids.
How is this different from Shape Sorter, which also involves 3D solids?
Net Folder is about the connection between a flat net and the 3D shape it becomes. Shape Sorter classifies finished solids by whether they roll. Different properties, different reasoning.