Keystones — Cornerstone
Five GCSE retrieval questions · 10 October 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 12 and 21
Answer: 3 -
2. Algebra Substitution
If x = 3, calculate x² + 2x + 8
Answer: 23 -
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 24% decrease?
Answer: 0.76 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 31, 29, 19, 32
Answer: Mean = 25.2, Median = 29, Range = 17