Keystones — Cornerstone
Five GCSE retrieval questions · 29 March 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 24 and 24
Answer: 3 -
2. Algebra Substitution
If x = 3, calculate x² + 2x + 3
Answer: 18 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 20cm
Answer: 62.83cm -
4. Ratio Percentage multipliers
What multiplier represents a 18% decrease?
Answer: 0.82 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 27, 47, 17, 21, 21
Answer: Mean = 26.6, Mode = 21, Median = 21, Range = 30