Keystones — Cornerstone
Five GCSE retrieval questions · 14 May 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 30 and 42
Answer: 6 -
2. Algebra Substitution
If x = 2, calculate x² + 2x + 6
Answer: 14 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 5cm
Answer: 15.71cm -
4. Ratio Percentage multipliers
What multiplier represents a 33% decrease?
Answer: 0.67 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 30, 16, 40, 35
Answer: Mean = 28.4, Median = 30, Range = 24