This activity investigates how you might make squares and pentominoes from Polydron.
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
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?
This practical investigation invites you to make tessellating shapes in a similar way to the artist Escher.
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
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?
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?
Have a go at making a few of these shapes from paper in different sizes. What patterns can you create?
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?
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?
An activity making various patterns with 2 x 1 rectangular tiles.
Try continuing these patterns made from triangles. Can you create your own repeating pattern?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
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?
This practical activity challenges you to create symmetrical designs by cutting a square into strips.
How can you put five cereal packets together to make different shapes if you must put them face-to-face?
How many triangles can you make on the 3 by 3 pegboard?
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?
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?
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.
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?
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
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?
Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?
These practical challenges are all about making a 'tray' and covering it with paper.
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
Can you make dice stairs using the rules stated? How do you know you have all the possible stairs?
Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?
Can you work out what shape is made when this piece of paper is folded up using the crease pattern shown?
How many models can you find which obey these rules?
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?
Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.
What do these two triangles have in common? How are they related?
Move four sticks so there are exactly four triangles.
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?
Here is a version of the game 'Happy Families' for you to make and play.
Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?
Can you make the birds from the egg tangram?
It's hard to make a snowflake with six perfect lines of symmetry, but it's fun to try!
Explore the triangles that can be made with seven sticks of the same length.
Follow these instructions to make a five-pointed snowflake from a square of paper.
You'll need a collection of cups for this activity.
Can you recreate this Indian screen pattern? Can you make up similar patterns of your own?
Ahmed is making rods using different numbers of cubes. Which rod is twice the length of his first rod?
Using a loop of string stretched around three of your fingers, what different triangles can you make? Draw them and sort them into groups.
This project challenges you to work out the number of cubes hidden under a cloth. What questions would you like to ask?
In this challenge, you will work in a group to investigate circular fences enclosing trees that are planted in square or triangular arrangements.
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?
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.