# Overlapping Again

What shape is the overlap when you slide one of these shapes half way across another? Can you picture it in your head? Use the interactivity to check your visualisation.

## Problem

You may want to look at Overlaps before you try this problem.

Here are some pairs of shapes:

Image

What overlap shape would you get if you overlapped them halfway across each other?

Here are some more pairs of shapes. What overlap shapes would you get this time?

Image

Which of these overlap shapes did you find?

Image

## Getting Started

Can you imagine gradually moving one shape across the other one?

It might help to draw the shapes, or cut some out from tissue paper or overhead transparencies.

## Student Solutions

We haven't had any correct solutions to this problem yet, but you can still send us your ideas - we'd love to hear from you.

## Teachers' Resources

**Why do this problem?**

This problem, as Overlaps, focuses on encouraging children to visualise - in this case to picture an image in their head. There are also valuable opportunities for them to apply their knowledge of properties of shape, and to use appropriate vocabulary.

Visualising can be a very useful way of getting into a problem, but it can also help at other stages of the problem-solving process. Providing opportunities like this for your class to practise visualising will help them to become familiar with its uses and to regard it as a legitimate skill to draw upon.

### Key questions

What are the two shapes you are thinking about?

Looking at the overlaps where the sides are diagonal, which shapes could they have come from?

Can you imagine gradually moving one shape across the other one?

### Possible extension

Learners who need more of a challenge could try Quadrilaterals.

### Possible support

Suggest trying this simpler version of the problem.