The Hair Colour Game

The Hair Colour Game

Mrs Bunting's class was playing a game using interlocking cubes. All the boys took a red cube and all the girls took a green cube.

Then the children took a black cube if they had dark coloured hair and a yellow cube if they had light coloured hair. They stuck their two cubes together.

The pairs of cubes looked like this:
 

The children then got into four groups according to their pair of cubes.

Can you explain what these pairs of cubes stand for?

 

Mrs Bunting showed them a way of recording the way they had sorted themselves into different groups, called a tree diagram.

 

At the bottom were all the pairs of cubes. Then they divided into two branches. The red cubes went to the left and the green cubes went to the right.

 

Then they divided into whether they had black cubes or yellow cubes. Now there were four branches.

 

Here is the tree diagram:

 

The next day they did the same again except that this time, they had three cubes each. As well as a having a green or red and a yellow or black, they took a brown cube if they had brown eyes and a blue cube if they had blue eyes.
 

How many different groups were there then? Can you draw the new tree diagram?

 

What happens if no one had dark hair and blue eyes? How could you show that?

Why do this problem?

This problem is designed to introduce, and practise making tree diagrams in a way practical for young children. It is primarily a group activity. You will need some interlocking cubes in various colours and some large sheets of paper. A mirror in the classroom would help the children decide on their hair and eye colour.

Possible approach

You could start by physically doing the activity like Mrs Bunting's class in the problem. Ask the group to collect a cube according to whether they are a girl (green cube) or a boy (red cube). Then they should decide for themselves whether their hair is light or dark, getting their friends to help if they want, and taking a yellow or black cube accordingly.

Key questions
 

Possible extension

For learners who found this straightforward, you could ask them to introduce another set of criteria of their choice.

Possible support

This task is best done in collaboration with others so encourage children to talk to each other and work together. Many children will be able to make the picture out of the cubes but may find recording on paper more difficult so you could take photos of their cube pictures.