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.

Past papers →

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