Keystones — Cornerstone
Five GCSE retrieval questions · 20 August 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 24 and 24
Answer: 3 -
2. Algebra Substitution
If x = 3, calculate x² + 4x + 8
Answer: 29 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 3cm
Answer: 18.85cm -
4. Ratio Percentage multipliers
What multiplier represents a 33% decrease?
Answer: 0.67 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 18, 30, 30, 33
Answer: Mean = 25.6, Median = 30, Range = 16