Keystones — Cornerstone
Five GCSE retrieval questions · 4 July 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 25 and 20
Answer: 5 -
2. Algebra Substitution
If x = 5, calculate x² + 5x + 7
Answer: 57 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 14cm
Answer: 87.96cm -
4. Ratio Percentage multipliers
What multiplier represents a 10% increase?
Answer: 1.1 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 31, 36, 15, 20
Answer: Mean = 25.2, Median = 24, Range = 21