A jigsaw where pieces only go together if the fractions are equivalent.
Here is a chance to create some attractive images by rotating shapes through multiples of 90 degrees, or 30 degrees, or 72 degrees or...
Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?
Interior angles can help us to work out which polygons will tessellate. Can we use similar ideas to predict which polygons combine to create semi-regular solids?
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
I start with a red, a blue, a green and a yellow marble. I can trade any of my marbles for three others, one of each colour. Can I end up with exactly two marbles of each colour?
I start with a red, a green and a blue marble. I can trade any of my marbles for two others, one of each colour. Can I end up with five more blue marbles than red after a number of such trades?
The Tower of Hanoi is an ancient mathematical challenge. Working on the building blocks may help you to explain the patterns you notice.
Delight your friends with this cunning trick! Can you explain how it works?
Here is a solitaire type environment for you to experiment with. Which targets can you reach?
These are pictures of the sea defences at New Brighton. Can you work out what a basic shape might be in both images of the sea wall and work out a way they might fit together?
You could use just coloured pencils and paper to create this design, but it will be more eye-catching if you can get hold of hammer, nails and string.
Learn how to draw circles using Logo. Wait a minute! Are they really circles? If not what are they?
Make a spiral mobile.
Move your counters through this snake of cards and see how far you can go. Are you surprised by where you end up?
How can you make an angle of 60 degrees by folding a sheet of paper twice?
How is it possible to predict the card?
Use the interactivity to play two of the bells in a pattern. How do you know when it is your turn to ring, and how do you know which bell to ring?
What shapes should Elly cut out to make a witch's hat? How can she make a taller hat?
Time for a little mathemagic! Choose any five cards from a pack and show four of them to your partner. How can they work out the fifth?
Using your knowledge of the properties of numbers, can you fill all the squares on the board?
As part of Liverpool08 European Capital of Culture there were a huge number of events and displays. One of the art installations was called "Turning the Place Over". Can you find our how it works?
Can Jo make a gym bag for her trainers from the piece of fabric she has?
Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?
Use the tangram pieces to make our pictures, or to design some of your own!
These models have appeared around the Centre for Mathematical Sciences. Perhaps you would like to try to make some similar models of your own.
Use the interactivity to listen to the bells ringing a pattern. Now it's your turn! Play one of the bells yourself. How do you know when it is your turn to ring?
Here is a chance to create some Celtic knots and explore the mathematics behind them.
Arrange 9 red cubes, 9 blue cubes and 9 yellow cubes into a large 3 by 3 cube. No row or column of cubes must contain two cubes of the same colour.
It might seem impossible but it is possible. How can you cut a playing card to make a hole big enough to walk through?
A game to make and play based on the number line.
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.
Make your own double-sided magic square. But can you complete both sides once you've made the pieces?
Exploring balance and centres of mass can be great fun. The resulting structures can seem impossible. Here are some images to encourage you to experiment with non-breakable objects of your own.
How does the time of dawn and dusk vary? What about the Moon, how does that change from night to night? Is the Sun always the same? Gather data to help you explore these questions.
Learn to write procedures and build them into Logo programs. Learn to use variables.
This part introduces the use of Logo for number work. Learn how to use Logo to generate sequences of numbers.
What shape would fit your pens and pencils best? How can you make it?
Build a scaffold out of drinking-straws to support a cup of water
Design and construct a prototype intercooler which will satisfy agreed quality control constraints.
What shape and size of drinks mat is best for flipping and catching?
More Logo for beginners. Learn to calculate exterior angles and draw regular polygons using procedures and variables.
Which of the following cubes can be made from these nets?
Make an equilateral triangle by folding paper and use it to make patterns of your own.
Make a clinometer and use it to help you estimate the heights of tall objects.
Make some celtic knot patterns using tiling techniques
A game in which players take it in turns to choose a number. Can you block your opponent?
Draw whirling squares and see how Fibonacci sequences and golden rectangles are connected.
This article for students gives some instructions about how to make some different braids.
Can you describe what happens in this film?