You have a set of the digits from 0 – 9. Can you arrange these in the 5 boxes to make two-digit numbers as close to the targets as possible?
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?
Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?
This was a problem for our birthday website. Can you use four of these pieces to form a square? How about making a square with all five pieces?
Can you make the birds from the egg tangram?
Can you fit the tangram pieces into the outline of Little Ming?
Ahmed is making rods using different numbers of cubes. Which rod is twice the length of his first rod?
Kate has eight multilink cubes. She has two red ones, two yellow, two green and two blue. She wants to fit them together to make a cube so that each colour shows on each face just once.
Take a rectangle of paper and fold it in half, and half again, to make four smaller rectangles. How many different ways can you fold it up?
Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.
Try continuing these patterns made from triangles. Can you create your own repeating pattern?
If you split the square into these two pieces, it is possible to fit the pieces together again to make a new shape. How many new shapes can you make?
These pictures show squares split into halves. Can you find other ways?
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?
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?
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?
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?
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?
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 make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
This practical investigation invites you to make tessellating shapes in a similar way to the artist Escher.
An activity making various patterns with 2 x 1 rectangular tiles.
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
Here is a version of the game 'Happy Families' for you to make and play.
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.
These practical challenges are all about making a 'tray' and covering it with paper.
A group of children are discussing the height of a tall tree. How would you go about finding out its height?
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?
Explore the triangles that can be made with seven sticks of the same length.
Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?
Can you make five differently sized squares from the tangram pieces?
How can you put five cereal packets together to make different shapes if you must put them face-to-face?
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
Ideas for practical ways of representing data such as Venn and Carroll diagrams.
For this activity which explores capacity, you will need to collect some bottles and jars.
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
You'll need a collection of cups for this activity.
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.
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.
You will need a long strip of paper for this task. Cut it into different lengths. How could you find out how long each piece is?
Let's say you can only use two different lengths - 2 units and 4 units. Using just these 2 lengths as the edges how many different cuboids can you make?
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
Can you describe a piece of paper clearly enough for your partner to know which piece it is?
Can you fit the tangram pieces into the outline of Wai Ping, Wah Ming and Chi Wing?
Have a go at drawing these stars which use six points drawn around a circle. Perhaps you can create your own designs?
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?