Make an equilateral triangle by folding paper and use it to make patterns of your own.
How can you make an angle of 60 degrees by folding a sheet of paper twice?
This practical activity involves measuring length/distance.
Did you know mazes tell stories? Find out more about mazes and make one of your own.
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
An activity making various patterns with 2 x 1 rectangular tiles.
Ideas for practical ways of representing data such as Venn and Carroll diagrams.
Here's a simple way to make a Tangram without any measuring or ruling lines.
Can you make the birds from the egg tangram?
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?
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
More Logo for beginners. Learn to calculate exterior angles and draw regular polygons using procedures and variables.
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Exploring and predicting folding, cutting and punching holes and making spirals.
What do these two triangles have in common? How are they related?
How can you put five cereal packets together to make different shapes if you must put them face-to-face?
Can you fit the tangram pieces into the outlines of these people?
Turn through bigger angles and draw stars with Logo.
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Make a cube out of straws and have a go at this practical challenge.
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?
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 junk?
Can you fit the tangram pieces into the outline of Wai Ping, Wah Ming and Chi Wing?
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?
Have a go at drawing these stars which use six points drawn around a circle. Perhaps you can create your own designs?
Can you fit the tangram pieces into the outline of Little Ming playing the board game?
Can you fit the tangram pieces into the outline of this telephone?
Can you recreate this Indian screen pattern? Can you make up similar patterns of your own?
Take a counter and surround it by a ring of other counters that MUST touch two others. How many are needed?
Follow the diagrams to make this patchwork piece, based on an octagon in a square.
Can you fit the tangram pieces into the outline of this brazier for roasting chestnuts?
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?
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
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.
Here is a solitaire type environment for you to experiment with. Which targets can you reach?
Can you fit the tangram pieces into the outline of Little Fung at the table?
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?
Can you create more models that follow these rules?
How many models can you find which obey these rules?
Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?
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?
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?
Make new patterns from simple turning instructions. You can have a go using pencil and paper or with a floor robot.
This is a simple paper-folding activity that gives an intriguing result which you can then investigate further.
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?
If these balls are put on a line with each ball touching the one in front and the one behind, which arrangement makes the shortest line of balls?