Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.
Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!
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.
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
A group activity using visualisation of squares and triangles.
Can you visualise what shape this piece of paper will make when it is folded?
Billy's class had a robot called Fred who could draw with chalk held underneath him. What shapes did the pupils make Fred draw?
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
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 fit the tangram pieces into the outlines of the workmen?
Can you fit the tangram pieces into the outline of Little Ming?
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
Can you fit the tangram pieces into the outline of this sports car?
Can you fit the tangram pieces into the outline of Granma T?
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
Exchange the positions of the two sets of counters in the least possible number of moves
Make a cube out of straws and have a go at this practical challenge.
Take a rectangle of paper and fold it in half, and half again, to make four smaller rectangles. How many different ways can you fold it up?
Try this interactive strategy game for 2
What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?
Can you fit the tangram pieces into the outline of this goat and giraffe?
What is the greatest number of squares you can make by overlapping three squares?
What is the relationship between these first two shapes? Which shape relates to the third one in the same way? Can you explain why?
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?
Here are more buildings to picture in your mind's eye. Watch out - they become quite complicated!
How can you paint the faces of these eight cubes so they can be put together to make a 2 x 2 cube that is green all over AND a 2 x 2 cube that is yellow all over?
A game has a special dice with a colour spot on each face. These three pictures show different views of the same dice. What colour is opposite blue?
Can you make a 3x3 cube with these shapes made from small cubes?
Make a flower design using the same shape made out of different sizes of paper.
Paint a stripe on a cardboard roll. Can you predict what will happen when it is rolled across a sheet of paper?
I've made some cubes and some cubes with holes in. This challenge invites you to explore the difference in the number of small cubes I've used. Can you see any patterns?
Can you cut up a square in the way shown and make the pieces into a triangle?
In each of the pictures the invitation is for you to: Count what you see. Identify how you think the pattern would continue.
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?
Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?
Can you fit the tangram pieces into the outline of this junk?
Can you fit the tangram pieces into the outline of these convex shapes?
Can you work out what is wrong with the cogs on a UK 2 pound coin?
In how many ways can you fit two of these yellow triangles together? Can you predict the number of ways two blue triangles can be fitted together?
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Can you fit the tangram pieces into the outline of the rocket?
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
Can you fit the tangram pieces into the outline of these rabbits?
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!
Can you fit the tangram pieces into the outline of the telescope and microscope?
Can you fit the tangram pieces into the outline of Wai Ping, Wah Ming and Chi Wing?
Can you fit the tangram pieces into the outline of this plaque design?
Can you fit the tangram pieces into the outline of this shape. How would you describe it?
This article for teachers describes a project which explores thepower of storytelling to convey concepts and ideas to children.
Can you fit the tangram pieces into the outline of Little Ming playing the board game?