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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.
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.
For learners who found this straightforward, you could ask them to introduce another set of criteria of their choice.
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.
You have been given three shapes made out of sponge: a sphere, a cylinder and a cone. Your challenge is to find out how to cut them to make different shapes for printing.
This article for students gives some instructions about how to make some different braids.
This article for pupils gives an introduction to Celtic knotwork patterns and a feel for how you can draw them.