A tree diagram in math is a tool that helps calculate the number of possible outcomes of a problem and cites those potential outcomes in an organized way.

Tree diagrams are a way of showing combinations of two or more events. Each branch is labelled at the end with its outcome and the probability is written alongside the line.

Learn about and revise how to write probabilities as fractions, decimals or percentages with this BBC Bitesize GCSE Maths Edexcel study guide.