This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
I cut this square into two different shapes. What can you say about the relationship between them?
If I use 12 green tiles to represent my lawn, how many different ways could I arrange them? How many border tiles would I need each time?
What can you say about these shapes? This problem challenges you to create shapes with different areas and perimeters.
These rectangles have been torn. How many squares did each one have inside it before it was ripped?
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.
An investigation that gives you the opportunity to make and justify predictions.
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
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 draw a square in which the perimeter is numerically equal to the area?
Here are many ideas for you to investigate - all linked with the number 2000.
How many ways can you find of tiling the square patio, using square tiles of different sizes?
Can you help the children find the two triangles which have the lengths of two sides numerically equal to their areas?
Explore one of these five pictures.
Imagine different shaped vessels being filled. Can you work out what the graphs of the water level should look like?
What is the largest 'ribbon square' you can make? And the smallest? How many different squares can you make altogether?
How many tiles do we need to tile these patios?
Cut differently-sized square corners from a square piece of paper to make boxes without lids. Do they all have the same volume?
What is the smallest number of tiles needed to tile this patio? Can you investigate patios of different sizes?
My local DIY shop calculates the price of its windows according to the area of glass and the length of frame used. Can you work out how they arrived at these prices?
These practical challenges are all about making a 'tray' and covering it with paper.
In this game for two players, you throw two dice and find the product. How many shapes can you draw on the grid which have that area or perimeter?
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?
Investigate the area of 'slices' cut off this cube of cheese. What would happen if you had different-sized block of cheese to start with?
A thoughtful shepherd used bales of straw to protect the area around his lambs. Explore how you can arrange the bales.
A follow-up activity to Tiles in the Garden.
Have a good look at these images. Can you describe what is happening? There are plenty more images like this on NRICH's Exploring Squares CD.
Read about David Hilbert who proved that any polygon could be cut up into a certain number of pieces that could be put back together to form any other polygon of equal area.
In how many ways can you halve a piece of A4 paper? How do you know they are halves?
How would you move the bands on the pegboard to alter these shapes?
This article for teachers gives some food for thought when teaching ideas about area.
Measure problems at primary level that require careful consideration.
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?
Use the information on these cards to draw the shape that is being described.
A simple visual exploration into halving and doubling.
Look at the mathematics that is all around us - this circular window is a wonderful example.
Measure problems for inquiring primary learners.
Grandpa was measuring a rug using yards, feet and inches. Can you help William to work out its area?
Measure problems at primary level that may require resilience.
Measure problems for primary learners to work on with others.
What do these two triangles have in common? How are they related?
How many centimetres of rope will I need to make another mat just like the one I have here?
Investigate how this pattern of squares continues. You could measure lengths, areas and angles.
You have pitched your tent (the red triangle) on an island. Can you move it to the position shown by the purple triangle making sure you obey the rules?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?
It is possible to dissect any square into smaller squares. What is the minimum number of squares a 13 by 13 square can be dissected into?
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
This rectangle is cut into five pieces which fit exactly into a triangular outline and also into a square outline where the triangle, the rectangle and the square have equal areas.