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?
These practical challenges are all about making a 'tray' and covering it with paper.
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?
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 activity investigates how you might make squares and pentominoes from Polydron.
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?
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.
Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?
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?
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?
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?
How can you put five cereal packets together to make different shapes if you must put them face-to-face?
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?
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.
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 make dice stairs using the rules stated? How do you know you have all the possible stairs?
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
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.
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?
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?
An activity making various patterns with 2 x 1 rectangular tiles.
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?
How many models can you find which obey these rules?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
These pictures show squares split into halves. Can you find other ways?
Exploring and predicting folding, cutting and punching holes and making spirals.
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
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.
Try continuing these patterns made from triangles. Can you create your own repeating pattern?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
For this activity which explores capacity, you will need to collect some bottles and jars.
Can you put these shapes in order of size? Start with the smallest.
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
What do these two triangles have in common? How are they related?
Using a loop of string stretched around three of your fingers, what different triangles can you make? Draw them and sort them into groups.
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 create more models that follow these rules?
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.
Explore the triangles that can be made with seven sticks of the same length.
Can you make the birds from the egg tangram?
Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.
Here is a version of the game 'Happy Families' for you to make and play.
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?
In this challenge, you will work in a group to investigate circular fences enclosing trees that are planted in square or triangular arrangements.
A group of children are discussing the height of a tall tree. How would you go about finding out its height?
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.