# 2. A cross-curricular approach

Pyramids interest pupils. Here we explore how to visualise different pyramids. The teacher in Case Study 2, by doing some cross-curricular work, showed his pupils that mathematics has connection to other subjects and to real life. Activity 2 looks at the mathematics of pyramids by asking pupils to make their own, using nets.

## Case Study 2: Looking at groundnut pyramids to motivate pupils in mathematics

When Mr Ahmadu planned his lesson, he wanted to involve other teachers and to give his pupils more than just a mathematical experience. He spoke to his colleagues in social studies and they gave him a pictures of groundnut pyramids in Maiduguri, Nigeria (see Resource 2).

He displayed the picture where all his pupils could see it and asked them to tell him what they knew about the picture. Mr Ahmadu made a mind map of what they knew about how the pyramids were built. (See Key Resource: Using mind maps and brainstorming to explore ideas [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] .)

Next, he organised them into small groups to discuss the pyramids and list any questions they had about them. He collected all their questions together and sorted out those that were about the structure of the pyramids and their shape.

He gave each group a pyramid that he had made from cards (see Resource 3: Nets). He asked the groups to think about the shape and structure and any common features – i.e. sides, edges and surfaces on each.

Next, he asked them to think how people were able to build such large structures as the pyramids in Maiduguri. He showed them more pictures of how pyramids were built and this really interested his class. As a result they asked their social studies teacher to tell them more about the pyramids.

Mr Ahmadu felt that this mixing of mathematics and social studies helped his pupils’ motivation as they began their mathematics work.

## Activity 2: Making paper pyramids

You will need copies of Resource 3, paper, scissors and sticky tape or glue. If you only have enough materials for one group to work at a time you can spread this activity over a week.

• Explain to your pupils that pyramids can have bases of any number of sides – the simplest have equilateral triangles on all four surfaces, but pyramids can be made with any regular polygon as a base: the groundnut pyramids are made of triangular sides, but have square bases.
• Give out the nets of triangular- and square-based pyramids, and ask pupils to cut, fold and glue these to make paper pyramids. Mount a display of them.
• Next, place some straws or matches on each group’s desk and ask if they can, using string or sticky tape, make a pyramid out of these materials. Go around and support the groups while they work. Let them share what they did to make their pyramids.

1. Using practical work

3. Using practical work to consolidate learning