Keystones — Cornerstone
Five GCSE retrieval questions · 2 July 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 = 8, find the value of 5x + 10
Answer: 50 -
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 30% decrease?
Answer: 0.7 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 29, 20, 32, 14
Answer: Mean = 22.6, Median = 20, Range = 18