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At least 20% of the marks across all six Edexcel GCSE Combined Science papers (1SC0) require mathematical skills. This lesson covers the key techniques you need to maximise your marks on every calculation question.
If you write the correct final answer with no working, you get full marks. But if your final answer is wrong and you showed no working, you get zero. If you showed correct working but made a small arithmetic error, you can still earn most of the marks.
Every calculation should follow this pattern:
| Step | What to do | Example |
|---|---|---|
| 1. Write the equation | From memory or the equation sheet | v = f × λ |
| 2. Substitute | Plug in the values with units | v = 500 Hz × 0.68 m |
| 3. Calculate | Do the arithmetic | v = 340 |
| 4. Unit and answer | State the final answer with the correct unit | v = 340 m/s |
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