Maths Skills in Biology GCSE Questions: Calculations & Units
Roughly 10% of marks on GCSE Biology can be maths skills—students searching biology GCSE questions often mean calculation practice, not essays.
Hub: Biology GCSE questions · Graph questions.
Calculation types that appear
Magnification
(\text{magnification} = \frac{\text{image size}}{\text{actual size}}) (same units)
- Image 48 mm, actual 0.12 mm → magnification = 400×
Percentages and percentage change
- Mass increased from 2.0 g to 2.6 g. Calculate percentage increase.
(\frac{0.6}{2.0} \times 100 = 30%)
Means and rates
- Calculate the mean time for three repeats: 42 s, 45 s, 39 s.
Show addition ÷ 3; watch significant figures if specified.
Ratios and proportions (genetics, ecology)
- Expected phenotype ratio 3:1 from a monohybrid cross.
Unit conversions
mm ↔ µm ↔ m — convert before dividing for magnification.
Mark-winning habits
- Show working when the question says so
- Include units on final answers
- Round only at the end unless told otherwise
- Check answer is sensible (magnification not 0.002× by mistake)
FAQ
Do I need GCSE Maths first?
Strong number skills help; biology papers teach the formulas in context.
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