Keystones — Cornerstone
Five GCSE retrieval questions · 9 October 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 4 and 10
Answer: 2 -
2. Algebra Substitution
If x = 4, calculate x² + 2x + 3
Answer: 27 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 16cm
Answer: 50.27cm -
4. Ratio Percentage multipliers
What multiplier represents a 28% decrease?
Answer: 0.72 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 20, 40, 31, 25
Answer: Mean = 27.6, Median = 25, Range = 20