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Approximately 20% of the marks across both Edexcel GCSE Chemistry papers require mathematical skills. That is roughly 40 marks out of 200 — the equivalent of several grade boundaries. Many students find calculations the most daunting part of the exam, but with a systematic approach and thorough practice, they become some of the most reliable marks available.
This lesson teaches you how to approach chemistry calculations for maximum marks, covering the key formulae, common errors, and the step-by-step method that earns full credit every time.
Edexcel provides a formulae sheet, but you should know these by heart so you do not waste time looking them up:
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