Keystones — Cornerstone
Five GCSE retrieval questions · 17 May 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 28 and 12
Answer: 4 -
2. Algebra Substitution
If x = 3, calculate x² + 5x + 2
Answer: 26 -
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 22% decrease?
Answer: 0.78 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 17, 25, 33, 35
Answer: Mean = 26.2, Median = 25, Range = 18