Keystones — Cornerstone
Five GCSE retrieval questions · 7 February 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 9 and 6
Answer: 3 -
2. Algebra Substitution
If x = 2, calculate x² + 6x + 3
Answer: 19 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 15cm
Answer: 94.25cm -
4. Ratio Percentage multipliers
What multiplier represents a 25% increase?
Answer: 1.25 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 38, 38, 23, 19, 38
Answer: Mean = 31.2, Mode = 38, Median = 38, Range = 19