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 work out what kind of rotation produced this pattern of pegs in our pegboard?
Can you picture where this letter "F" will be on the grid if you flip it in these different ways?
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
How many different ways can you find of fitting five hexagons together? How will you know you have found all the ways?
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?
Here are more buildings to picture in your mind's eye. Watch out - they become quite complicated!
Choose a box and work out the smallest rectangle of paper needed to wrap it so that it is completely covered.
Exploring and predicting folding, cutting and punching holes and making spirals.
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?
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 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?
This problem invites you to build 3D shapes using two different triangles. Can you make the shapes from the pictures?
Paint a stripe on a cardboard roll. Can you predict what will happen when it is rolled across a sheet of paper?
A group activity using visualisation of squares and triangles.
What shape is made when you fold using this crease pattern? Can you make a ring design?
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?
Find a way to cut a 4 by 4 square into only two pieces, then rejoin the two pieces to make an L shape 6 units high.
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.
What is the relationship between these first two shapes? Which shape relates to the third one in the same way? Can you explain why?
What are the next three numbers in this sequence? Can you explain why are they called pyramid numbers?
Reasoning about the number of matches needed to build squares that share their sides.
Have a look at what happens when you pull a reef knot and a granny knot tight. Which do you think is best for securing things together? Why?
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
On which of these shapes can you trace a path along all of its edges, without going over any edge twice?
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?
Can you predict when you'll be clapping and when you'll be clicking if you start this rhythm? How about when a friend begins a new rhythm at the same time?
Make a cube out of straws and have a go at this practical challenge.
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.
Make a flower design using the same shape made out of different sizes of paper.
Each of the nets of nine solid shapes has been cut into two pieces. Can you see which pieces go together?
How can you paint the faces of these eight cubes so they can be put together to make a 2 x 2 x 2 cube that is green all over AND a 2 x 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?
Imagine a 4 by 4 by 4 cube. If you and a friend drill holes in some of the small cubes in the ways described, how many will not have holes drilled through them?
Can you cut up a square in the way shown and make the pieces into a triangle?
Which of these dice are right-handed and which are left-handed?
A shape and space game for 2,3 or 4 players. Be the last person to be able to place a pentomino piece on the playing board. Play with card, or on the computer.
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?
Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.
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.
The triangle ABC is equilateral. The arc AB has centre C, the arc BC has centre A and the arc CA has centre B. Explain how and why this shape can roll along between two parallel tracks.
What happens when you turn these cogs? Investigate the differences between turning two cogs of different sizes and two cogs which are the same.
This article for teachers describes a project which explores the power of storytelling to convey concepts and ideas to children.
Can you work out what is wrong with the cogs on a UK 2 pound coin?
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.
Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!
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?