What do these two triangles have in common? How are they related?
These pictures were made by starting with a square, finding the
half-way point on each side and joining those points up. You could
investigate your own starting shape.
Investigate how this pattern of squares continues. You could
measure lengths, areas and angles.
Polygonal numbers are those that are arranged in shapes as they enlarge. Explore the polygonal numbers drawn here.
What is the smallest number of tiles needed to tile this patio? Can
you investigate patios of different sizes?
Place the 16 different combinations of cup/saucer in this 4 by 4
arrangement so that no row or column contains more than one cup or
saucer of the same colour.
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?
When newspaper pages get separated at home we have to try to sort
them out and get things in the correct order. How many ways can we
arrange these pages so that the numbering may be different?
Cut differently-sized square corners from a square piece of paper
to make boxes without lids. Do they all have the same volume?
How many ways can you find of tiling the square patio, using square
tiles of different sizes?
If we had 16 light bars which digital numbers could we make? How
will you know you've found them all?
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 thoughtful shepherd used bales of straw to protect the area
around his lambs. Explore how you can arrange the bales.
Which times on a digital clock have a line of symmetry? Which look
the same upside-down? You might like to try this investigation and
Can you find ways of joining cubes together so that 28 faces are
I cut this square into two different shapes. What can you say about
the relationship between them?
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?
An investigation that gives you the opportunity to make and justify
This article for teachers suggests ideas for activities built around 10 and 2010.
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
While we were sorting some papers we found 3 strange sheets which
seemed to come from small books but there were page numbers at the
foot of each page. Did the pages come from the same book?
Investigate the number of faces you can see when you arrange three cubes in different ways.
This challenge extends the Plants investigation so now four or more children are involved.
A group of children are discussing the height of a tall tree. How would you go about finding out its height?
If you have three circular objects, you could arrange them so that
they are separate, touching, overlapping or inside each other. Can
you investigate all the different possibilities?
Three children are going to buy some plants for their birthdays. They will plant them within circular paths. How could they do this?
Use the interactivity to find all the different right-angled
triangles you can make by just moving one corner of the starting
Explore Alex's number plumber. What questions would you like to ask? What do you think is happening to the numbers?
Can you continue this pattern of triangles and begin to predict how
many sticks are used for each new "layer"?
Compare the numbers of particular tiles in one or all of these
three designs, inspired by the floor tiles of a church in
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.
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.
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
The challenge here is to find as many routes as you can for a fence
to go so that this town is divided up into two halves, each with 8
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?
In my local town there are three supermarkets which each has a
special deal on some products. If you bought all your shopping in
one shop, where would be the cheapest?
48 is called an abundant number because it is less than the sum of
its factors (without itself). Can you find some more abundant
In this investigation, you must try to make houses using cubes. If
the base must not spill over 4 squares and you have 7 cubes which
stand for 7 rooms, what different designs can you come up with?
This problem is based on the story of the Pied Piper of Hamelin. Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!
Can you find out how the 6-triangle shape is transformed in these
tessellations? Will the tessellations go on for ever? Why or why
Explore the different tunes you can make with these five gourds.
What are the similarities and differences between the two tunes you
What is the largest cuboid you can wrap in an A3 sheet of paper?
A description of some experiments in which you can make discoveries about triangles.
An activity making various patterns with 2 x 1 rectangular tiles.
What is the smallest cuboid that you can put in this box so that
you cannot fit another that's the same into it?
Use the interactivity to investigate what kinds of triangles can be
drawn on peg boards with different numbers of pegs.
Investigate what happens when you add house numbers along a street
in different ways.
This activity asks you to collect information about the birds you
see in the garden. Are there patterns in the data or do the birds
seem to visit randomly?
Have a go at this 3D extension to the Pebbles problem.
Take a look at these data collected by children in 1986 as part of the Domesday Project. What do they tell you? What do you think about the way they are presented?