Use your mouse to move the red and green parts of this disc. Can you make images which show the turnings described?
These pictures show squares split into halves. Can you find other ways?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
Can you find ways of joining cubes together so that 28 faces are visible?
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
In this challenge, you will work in a group to investigate circular fences enclosing trees that are planted in square or triangular arrangements.
Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?
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.
Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.
Explore the triangles that can be made with seven sticks of the same length.
Explore the different tunes you can make with these five gourds. What are the similarities and differences between the two tunes you are given?
Make new patterns from simple turning instructions. You can have a go using pencil and paper or with a floor robot.
Try continuing these patterns made from triangles. Can you create your own repeating pattern?
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?
Investigate the number of paths you can take from one vertex to another in these 3D shapes. Is it possible to take an odd number and an even number of paths to the same vertex?
A group of children are discussing the height of a tall tree. How would you go about finding out its height?
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
Sort the houses in my street into different groups. Can you do it in any other ways?
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 create more models that follow these rules?
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
This practical investigation invites you to make tessellating shapes in a similar way to the artist Escher.
This challenge involves eight three-cube models made from interlocking cubes. Investigate different ways of putting the models together then compare your constructions.
How can you arrange these 10 matches in four piles so that when you move one match from three of the piles into the fourth, you end up with the same arrangement?
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?
How many triangles can you make on the 3 by 3 pegboard?
What do these two triangles have in common? How are they related?
How many different ways can you find of fitting five hexagons together? How will you know you have found all the ways?
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?
An activity making various patterns with 2 x 1 rectangular tiles.
If we had 16 light bars which digital numbers could we make? How will you know you've found them all?
This challenging activity involves finding different ways to distribute fifteen items among four sets, when the sets must include three, four, five and six items.
Investigate all the different squares you can make on this 5 by 5 grid by making your starting side go from the bottom left hand point. Can you find out the areas of all these squares?
A challenging activity focusing on finding all possible ways of stacking rods.
In how many ways can you stack these rods, following the rules?
This tricky challenge asks you to find ways of going across rectangles, going through exactly ten squares.
This challenge extends the Plants investigation so now four or more children are involved.
Have a go at this 3D extension to the Pebbles problem.
What is the smallest cuboid that you can put in this box so that you cannot fit another that's the same into it?
I like to walk along the cracks of the paving stones, but not the outside edge of the path itself. How many different routes can you find for me to take?
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?
Investigate the different ways you could split up these rooms so that you have double the number.
How many shapes can you build from three red and two green cubes? Can you use what you've found out to predict the number for four red and two green?
How many models can you find which obey these rules?
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
Ana and Ross looked in a trunk in the attic. They found old cloaks and gowns, hats and masks. How many possible costumes could they make?
You cannot choose a selection of ice cream flavours that includes totally what someone has already chosen. Have a go and find all the different ways in which seven children can have ice cream.
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?
There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?
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.