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39 problems, 3 games, 40 articles, 2 general resources, 1 interactive environment, 2 projects, 47 Lists

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

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?

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

This problem challenges you to work out what fraction of the whole area of these pictures is taken up by various shapes.

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

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?

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?

A simple visual exploration into halving and doubling.

A problem that is set to alert thinking when answers to a previous task are explored.

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

What is the smallest number of tiles needed to tile this patio? Can you investigate patios of different sizes?

Measure problems for you to work on with others.

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.

Investigate the successive areas of light blue in these diagrams.

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

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.

This task is a follow on from "What numbers where?" and extends it into an investigation.

Measure problems for primary learners to work on with others.

Start with a large square, join the midpoints of its sides, you'll see four right angled triangles. Remove these triangles, a second square is left. Repeat the operation. What happens?

What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?

This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.

This activity is based on data in the book 'If the World Were a Village'. How will you represent your chosen data for maximum effect?

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

These resources introduce and explore the concepts of area and perimeter.

These articles, written for primary teachers, offer guidance on the teaching and learning of geometry.

In this article for teachers, Bernard uses some problems to suggest that once a numerical pattern has been spotted from a practical starting point, going back to the practical can help explain. . . .

Pythagoras of Samos was a Greek philosopher who lived from about 580 BC to about 500 BC. Find out about the important developments he made in mathematics, astronomy, and the theory of music.

Billy's class had a robot called Fred who could draw with chalk held underneath him. What shapes did the pupils make Fred draw?

Grandpa was measuring a rug using yards, feet and inches. Can you help William to work out its area?

Read all about the number pi and the mathematicians who have tried to find out its value as accurately as possible.

Have a go at finding the perimeter and area of shapes in these challenges, which will ask you to measure the inside and the outside of different shapes.

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

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

Are you resilient enough to solve these measure problems?

Measure problems for upper primary that will get you thinking.

Measure problems at primary level that may require resilience.

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?

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?

This article, written for teachers, discusses the merits of different kinds of resources: those which involve exploration and those which centre on calculation.

This feature brings together activities which make use of a geoboard or pegboard.

Can you help the children find the two triangles which have the lengths of two sides numerically equal to their areas?

What is the same and what is different about these tiling patterns and how do they contribute to the floor as a whole?