Keystones — Cornerstone
Five GCSE retrieval questions · 23 August 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 8 and 24
Answer: 4 -
2. Algebra Substitution
If x = 5, calculate x² + 6x + 4
Answer: 59 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 5cm
Answer: 31.42cm -
4. Ratio Percentage multipliers
What multiplier represents a 34% decrease?
Answer: 0.66 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 27, 10, 29, 40
Answer: Mean = 24.4, Median = 27, Range = 30