How would you move the bands on the pegboard to alter these shapes?
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.
This article for teachers gives some food for thought when teaching ideas about area.
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.
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?
Grandpa was measuring a rug using yards, feet and inches. Can you help William to work out its area?
In how many ways can you halve a piece of A4 paper? How do you know they are halves?
Look at the mathematics that is all around us - this circular window is a wonderful example.
Use the information on these cards to draw the shape that is being described.
A simple visual exploration into halving and doubling.
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
How many centimetres of rope will I need to make another mat just like the one I have here?
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?
Nine squares with side lengths 1, 4, 7, 8, 9, 10, 14, 15, and 18 cm can be fitted together to form a rectangle. What are the dimensions of the rectangle?
What is the smallest number of tiles needed to tile this patio? Can you investigate patios of different sizes?
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
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.
Can you draw a square in which the perimeter is numerically equal to the area?
Can you help the children find the two triangles which have the lengths of two sides numerically equal to their areas?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
How many ways can you find of tiling the square patio, using square tiles of different sizes?
Explore one of these five pictures.
How can you change the area of a shape but keep its perimeter the same? How can you change the perimeter but keep the area the same?
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?
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 rectangles have been torn. How many squares did each one have inside it before it was ripped?
What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?
How many tiles do we need to tile these patios?
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.
What do these two triangles have in common? How are they related?
Can you work out the area of the inner square and give an explanation of how you did it?
What shape has Harry drawn on this clock face? Can you find its area? What is the largest number of square tiles that could cover this area?
Follow the instructions and you can take a rectangle, cut it into 4 pieces, discard two small triangles, put together the remaining two pieces and end up with a rectangle the same size. Try it!
Determine the total shaded area of the 'kissing triangles'.
An activity for high-attaining learners which involves making a new cylinder from a cardboard tube.
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 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 area of 'slices' cut off this cube of cheese. What would happen if you had different-sized block of cheese to start with?
These practical challenges are all about making a 'tray' and covering it with paper.
What is the largest 'ribbon square' you can make? And the smallest? How many different squares can you make altogether?
A task which depends on members of the group noticing the needs of others and responding.
I cut this square into two different shapes. What can you say about the relationship between them?
Measure problems at primary level that require careful consideration.
Measure problems for primary learners to work on with others.
Measure problems for inquiring primary learners.
An investigation that gives you the opportunity to make and justify predictions.
Measure problems at primary level that may require resilience.
Polygons drawn on square dotty paper have dots on their perimeter (p) and often internal (i) ones as well. Find a relationship between p, i and the area of the polygons.