Keystones — Cornerstone
Five GCSE retrieval questions · 13 May 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 30 and 45?
Answer: 15 -
2. Algebra Substitution
If x = 5, calculate x² + 5x + 5
Answer: 55 -
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 40% decrease?
Answer: 0.6 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 27, 27, 19, 14, 38
Answer: Mean = 25, Mode = 27, Median = 27, Range = 24