Keystones — Cornerstone
Five GCSE retrieval questions · 19 August 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 15 and 21
Answer: 3 -
2. Algebra Substitution
If x = 4, calculate x² + 3x + 2
Answer: 30 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 4cm
Answer: 25.13cm -
4. Ratio Percentage multipliers
What multiplier represents a 16% decrease?
Answer: 0.84 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 26, 31, 33, 33, 29
Answer: Mean = 30.4, Mode = 33, Median = 31, Range = 7