Keystones — Cornerstone
Five GCSE retrieval questions · 30 June 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 25 and 30
Answer: 5 -
2. Algebra Substitution
If x = 2, calculate x² + 2x + 2
Answer: 10 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 7cm
Answer: 21.99cm -
4. Ratio Percentage multipliers
What multiplier represents a 18% decrease?
Answer: 0.82 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 27, 38, 29, 19
Answer: Mean = 26.2, Median = 27, Range = 20