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.

Look at the mathematics that is all around us - this circular window is a wonderful example.

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 determination.

Measure problems at primary level that require careful consideration.

Measure problems for inquiring primary learners.

Measure problems for primary learners to work on with others.

An activity for high-attaining learners which involves making a new cylinder from a cardboard tube.

This article for teachers gives some food for thought when teaching ideas about area.

Here are many ideas for you to investigate - all linked with the number 2000.

Can you draw a square in which the perimeter is numerically equal to the area?

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?

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.

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.

I cut this square into two different shapes. What can you say about the relationship between them?

Use the information on these cards to draw the shape that is being described.

A simple visual exploration into halving and doubling.

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?

What is the largest 'ribbon square' you can make? And the smallest? How many different squares can you make altogether?

I'm thinking of a rectangle with an area of 24. What could its perimeter be?

A follow-up activity to Tiles in the Garden.

What can you say about these shapes? This problem challenges you to create shapes with different areas and perimeters.

What happens to the area and volume of 2D and 3D shapes when you enlarge them?

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?

Investigate how this pattern of squares continues. You could measure lengths, areas and angles.

How would you move the bands on the pegboard to alter these shapes?

Can you find rectangles where the value of the area is the same as the value of the perimeter?

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?

Can you work out the area of the inner square and give an explanation of how you did it?

Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?

How have "Warmsnug" arrived at the prices shown on their windows? Which window has been given an incorrect price?

A thoughtful shepherd used bales of straw to protect the area around his lambs. Explore how you can arrange the bales.

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 rectangles have been torn. How many squares did each one have inside it before it was ripped?

Semicircles are drawn on the sides of a rectangle ABCD. A circle passing through points ABCD carves out four crescent-shaped regions. Prove that the sum of the areas of the four crescents is equal to. . . .

Which is a better fit, a square peg in a round hole or a round peg in a square hole?

An investigation that gives you the opportunity to make and justify predictions.

You have a 12 by 9 foot carpet with an 8 by 1 foot hole exactly in the middle. Cut the carpet into two pieces to make a 10 by 10 foot square carpet.

Investigate the different ways of cutting a perfectly circular pie into equal pieces using exactly 3 cuts. The cuts have to be along chords of the circle (which might be diameters).

It's easy to work out the areas of most squares that we meet, but what if they were tilted?

What do these two triangles have in common? How are they related?

Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.

What are the areas of these triangles? What do you notice? Can you generalise to other "families" of triangles?

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?

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?

Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?

Determine the total shaded area of the 'kissing triangles'.