Each of the nets of nine solid shapes has been cut into two pieces. Can you see which pieces go together?
You want to make each of the 5 Platonic solids and colour the faces so that, in every case, no two faces which meet along an edge have the same colour.
Can you arrange the shapes in a chain so that each one shares a face (or faces) that are the same shape as the one that follows it?
Here are the six faces of a cube - in no particular order. Here are three views of the cube. Can you deduce where the faces are in relation to each other and record them on the net of this cube?
You have been given three shapes made out of sponge: a sphere, a cylinder and a cone. Your challenge is to find out how to cut them to make different shapes for printing.
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
On which of these shapes can you trace a path along all of its edges, without going over any edge twice?
This problem invites you to build 3D shapes using two different triangles. Can you make the shapes from the pictures?
A toy has a regular tetrahedron, a cube and a base with triangular and square hollows. If you fit a shape into the correct hollow a bell rings. How many times does the bell ring in a complete game?
These points all mark the vertices (corners) of ten hidden squares. Can you find the 10 hidden squares?
This article looks at levels of geometric thinking and the types of activities required to develop this thinking.
Can you fit the tangram pieces into the outlines of the convex shapes?
Can you work out what is wrong with the cogs on a UK 2 pound coin?
This article for teachers describes a project which explores the power of storytelling to convey concepts and ideas to children.
What happens when you turn these cogs? Investigate the differences between turning two cogs of different sizes and two cogs which are the same.
A game for 2 players. Given a board of dots in a grid pattern, players take turns drawing a line by connecting 2 adjacent dots. Your goal is to complete more squares than your opponent.
Which of these dice are right-handed and which are left-handed?
Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.
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!
Reasoning about the number of matches needed to build squares that share their sides.
An extension of noughts and crosses in which the grid is enlarged and the length of the winning line can to altered to 3, 4 or 5.
Make a flower design using the same shape made out of different sizes of paper.
Make a cube out of straws and have a go at this practical challenge.
Imagine a 3 by 3 by 3 cube made of 9 small cubes. Each face of the large cube is painted a different colour. How many small cubes will have two painted faces? Where are they?
Investigate the number of paths you can take from one vertex to another in these 3D shapes. Is it possible to take an odd number and an even number of paths to the same vertex?
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
Can you make a 3x3 cube with these shapes made from small cubes?
Can you fit the tangram pieces into the outline of Mah Ling?
Can you fit the tangram pieces into the outlines of the lobster, yacht and cyclist?
Can you fit the tangram pieces into the outlines of the people?
Can you cut up a square in the way shown and make the pieces into a triangle?
Can you work out what shape is made by folding in this way? Why not create some patterns using this shape but in different sizes?
For this task, you'll need an A4 sheet and two A5 transparent sheets. Decide on a way of arranging the A5 sheets on top of the A4 sheet and explore ...
Can you visualise what shape this piece of paper will make when it is folded?
Why do you think that the red player chose that particular dot in this game of Seeing Squares?
Can you fit the tangram pieces into the outline of the plaque design?
Can you fit the tangram pieces into the silhouette of the junk?
Can you fit the tangram pieces into the outlines of Mah Ling and Chi Wing?
Can you fit the tangram pieces into the outline of the playing piece?
Can you fit the tangram pieces into the outline of the clock?
Can you fit the tangram pieces into the outline of Granma T?
Can you fit the tangram pieces into the outlines of the rabbits?
Can you fit the tangram pieces into the outlines of the chairs?
Can you fit the tangram pieces into the outline of the dragon?
Can you fit the tangram pieces into the outlines of Wai Ping, Wu Ming and Chi Wing?
Read about the adventures of Granma T and her grandchildren in this series of stories, accompanied by interactive tangrams.
Can you fit the tangram pieces into the outlines of the camel and giraffe?
Can you logically construct these silhouettes using the tangram pieces?
Have a look at these photos of different fruit. How many do you see? How did you count?