You may also like

problem icon

Plants

Three children are going to buy some plants for their birthdays. They will plant them within circular paths. How could they do this?

problem icon

Gran, How Old Are You?

When Charlie asked his grandmother how old she is, he didn't get a straightforward reply! Can you work out how old she is?

problem icon

Follow the Numbers

What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.

Shaping It

Stage: 1 and 2 Challenge Level: Challenge Level:1

start
These pictures were made quite simply by starting with a square, finding the half-way point on each side and joining those points up. This creates a smaller shape (which also happens to be a square) inside the original. The half-way points of this new shape are then joined up to make a third shape. This way of making new shapes is continued until it gets too small to do properly. 

You can, of course, start with any straight-lined shape.

Here's one where I've coloured each new halving line to help to see what has happened more clearly.
 
 odd

So, it's your turn to have a go.

It's probably good to start with a fairly large shape since it's going to get smaller and smaller each time.
 
Here are some challenges for you to pursue:
 
  • Having made a design like one above, cut out the triangles and the smallest inner shape and rearrange the pieces to form a new shape/design.
  • Talk about and record the things you notice as you have drawn more and more halving lines.
  • What is happening to the enclosed area each time the sides are halved?  (Try investigating a regular shape first.)
This problem is based on an idea suggested by Ian Short.