Can you recreate this Indian screen pattern? Can you make up similar patterns of your own?
It's hard to make a snowflake with six perfect lines of symmetry, but it's fun to try!
Can you describe what happens in this film?
Follow these instructions to make a five-pointed snowflake from a square of paper.
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.
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
Here is a chance to create some Celtic knots and explore the mathematics behind them.
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
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 deduce the pattern that has been used to lay out these bottle tops?
How many differently shaped rectangles can you build using these equilateral and isosceles triangles? Can you make a square?
Here is a chance to create some attractive images by rotating shapes through multiples of 90 degrees, or 30 degrees, or 72 degrees or...
A brief video looking at how you can sometimes use symmetry to distinguish knots. Can you use this idea to investigate the differences between the granny knot and the reef knot?
Here's a simple way to make a Tangram without any measuring or ruling lines.
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Can you make the birds from the egg tangram?
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
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?
An activity making various patterns with 2 x 1 rectangular tiles.
Ideas for practical ways of representing data such as Venn and Carroll diagrams.
Make a cube out of straws and have a go at this practical challenge.
Exploring and predicting folding, cutting and punching holes and making spirals.
Can you fit the tangram pieces into the outlines of these clocks?
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Can you fit the tangram pieces into the outlines of these people?
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
Kaia is sure that her father has worn a particular tie twice a week in at least five of the last ten weeks, but her father disagrees. Who do you think is right?
Here is a solitaire type environment for you to experiment with. Which targets can you reach?
Have a go at drawing these stars which use six points drawn around a circle. Perhaps you can create your own designs?
Take 5 cubes of one colour and 2 of another colour. How many different ways can you join them if the 5 must touch the table and the 2 must not touch the table?
Take a counter and surround it by a ring of other counters that MUST touch two others. How many are needed?
Can you fit the tangram pieces into the outline of Wai Ping, Wah Ming and Chi Wing?
What happens to the area of a square if you double the length of the sides? Try the same thing with rectangles, diamonds and other shapes. How do the four smaller ones fit into the larger one?
Can you fit the tangram pieces into the outline of this telephone?
Can you fit the tangram pieces into the outline of Little Ming playing the board game?
Follow the diagrams to make this patchwork piece, based on an octagon in a square.
Using different numbers of sticks, how many different triangles are you able to make? Can you make any rules about the numbers of sticks that make the most triangles?
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
Can you fit the tangram pieces into the outline of this brazier for roasting chestnuts?
Can you fit the tangram pieces into the outline of Little Fung at the table?
Can you fit the tangram pieces into the outline of this junk?
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?
Watch the video to see how to fold a square of paper to create a flower. What fraction of the piece of paper is the small triangle?
Can you create more models that follow these rules?
How many models can you find which obey these rules?
What is the largest number of circles we can fit into the frame without them overlapping? How do you know? What will happen if you try the other shapes?
This is a simple paper-folding activity that gives an intriguing result which you can then investigate further.
How can you make a curve from straight strips of paper?
Make new patterns from simple turning instructions. You can have a go using pencil and paper or with a floor robot.