Make a cube out of straws and have a go at this practical
Reasoning about the number of matches needed to build squares that
share their sides.
How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!
A toy has a regular tetrahedron, a cube and a base with triangular and square hollows.
If you press the start button and fit the tetrahedron into the triangular hollow or the cube into the square hollow, it rings a bell.
It only rings the bell again if you then fit the tetrahedron or the cube into its hollow in a different way from any you have done before.
When you have fitted the shapes into the hollows in all the possible ways, the game is complete.
How many times does the bell ring in a complete game?