Calculating probabilities How to describe probabilities and the probability scale Learn about probability, the probability scale and how to express probabilities with this BBC Bitesize Maths article.

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

As a result, students can develop early gaps in their understanding of fundamental ideas—like similarity in shapes or conditional probability—that undermine their performance years later.