Keystones — Cornerstone
Five GCSE retrieval questions · 18 August 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 20 and 30?
Answer: 10 -
2. Algebra Substitution
If x = 8, find the value of 4x + 9
Answer: 41 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 18cm
Answer: 56.55cm -
4. Ratio Percentage multipliers
What multiplier represents a 18% decrease?
Answer: 0.82 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 33, 25, 26, 34
Answer: Mean = 26.4, Median = 26, Range = 20