Keystones — Cornerstone
Five GCSE retrieval questions · 26 March 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 12 and 30
Answer: 6 -
2. Algebra Substitution
If x = 5, calculate x² + 3x + 5
Answer: 45 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 4cm
Answer: 12.57cm -
4. Ratio Percentage multipliers
What multiplier represents a 28% decrease?
Answer: 0.72 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 21, 18, 49, 37, 37
Answer: Mean = 32.4, Mode = 37, Median = 37, Range = 31