What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?
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?
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?
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?
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.
How many triangles can you make on the 3 by 3 pegboard?
How can you arrange the 5 cubes so that you need the smallest number of Brush Loads of paint to cover them? Try with other numbers of cubes as well.
What is the smallest cuboid that you can put in this box so that you cannot fit another that's the same into it?
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?
Try continuing these patterns made from triangles. Can you create your own repeating pattern?
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?
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?
The ancient Egyptians were said to make right-angled triangles using a rope with twelve equal sections divided by knots. What other triangles could you make if you had a rope like this?
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?
How many models can you find which obey these rules?
These practical challenges are all about making a 'tray' and covering it with paper.
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?
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
An activity making various patterns with 2 x 1 rectangular tiles.
How can you put five cereal packets together to make different shapes if you must put them face-to-face?
This practical investigation invites you to make tessellating shapes in a similar way to the artist Escher.
Can you recreate this Indian screen pattern? Can you make up similar patterns of your own?
Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?
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?
Follow these instructions to make a five-pointed snowflake from a square of paper.
A group of children are discussing the height of a tall tree. How would you go about finding out its height?
Can you make dice stairs using the rules stated? How do you know you have all the possible stairs?
Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.
It's hard to make a snowflake with six perfect lines of symmetry, but it's fun to try!
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.
Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?
Explore the triangles that can be made with seven sticks of the same length.
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?
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
In this town, houses are built with one room for each person. There are some families of seven people living in the town. In how many different ways can they build their houses?
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?
Can you create more models that follow these rules?
In this challenge, you will work in a group to investigate circular fences enclosing trees that are planted in square or triangular arrangements.
This practical activity challenges you to create symmetrical designs by cutting a square into strips.
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 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 order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?
We went to the cinema and decided to buy some bags of popcorn so we asked about the prices. Investigate how much popcorn each bag holds so find out which we might have bought.
Can you make five differently sized squares from the tangram pieces?
Can you make the birds from the egg tangram?
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?