Can you each work out what shape you have part of on your card? What will the rest of it look like?
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
Can you work out what shape is made when this piece of paper is folded up using the crease pattern shown?
These pictures show squares split into halves. Can you find other ways?
Can you lay out the pictures of the drinks in the way described by the clue cards?
This challenge invites you to create your own picture using just straight lines. Can you identify shapes with the same number of sides and decorate them in the same way?
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?
This practical activity challenges you to create symmetrical designs by cutting a square into strips.
What is the greatest number of squares you can make by overlapping three squares?
Move four sticks so there are exactly four triangles.
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
Kimie and Sebastian were making sticks from interlocking cubes and lining them up. Can they make their lines the same length? Can they make any other lines?
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?
Have a go at making a few of these shapes from paper in different sizes. What patterns can you create?
Sara and Will were sorting some pictures of shapes on cards. "I'll collect the circles," said Sara. "I'll take the red ones," answered Will. Can you see any cards they would both want?
Can you split each of the shapes below in half so that the two parts are exactly the same?
In this activity focusing on capacity, you will need a collection of different jars and bottles.
Can you make a rectangle with just 2 dominoes? What about 3, 4, 5, 6, 7...?
Cut a square of paper into three pieces as shown. Now,can you use the 3 pieces to make a large triangle, a parallelogram and the square again?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
Can you make five differently sized squares from the tangram pieces?
A group of children are discussing the height of a tall tree. How would you go about finding out its height?
For this activity which explores capacity, you will need to collect some bottles and jars.
An activity making various patterns with 2 x 1 rectangular tiles.
Ideas for practical ways of representing data such as Venn and Carroll diagrams.
Factors and Multiples game for an adult and child. How can you make sure you win this game?
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?
What do these two triangles have in common? How are they related?
Have you ever noticed the patterns in car wheel trims? These questions will make you look at car wheels in a different way!
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
Exploring and predicting folding, cutting and punching holes and making spirals.
We can cut a small triangle off the corner of a square and then fit the two pieces together. Can you work out how these shapes are made from the two pieces?
Here's a simple way to make a Tangram without any measuring or ruling lines.
Make a cube out of straws and have a go at this practical challenge.
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
This problem focuses on Dienes' Logiblocs. What is the same and what is different about these pairs of shapes? Can you describe the shapes in the picture?
Can you recreate this Indian screen pattern? Can you make up similar patterns of your own?
Watch this "Notes on a Triangle" film. Can you recreate parts of the film using cut-out triangles?
Can you fit the tangram pieces into the outline of this junk?
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?
Have a go at drawing these stars which use six points drawn around a circle. Perhaps you can create your own designs?
Can you describe a piece of paper clearly enough for your partner to know which piece it is?
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
This problem invites you to build 3D shapes using two different triangles. Can you make the shapes from the pictures?
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?
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
Can you see which tile is the odd one out in this design? Using the basic tile, can you make a repeating pattern to decorate our wall?