Keystones — Cornerstone
Five GCSE retrieval questions · 29 June 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 24 and 36?
Answer: 12 -
2. Algebra Substitution
If x = 2, calculate x² + 2x + 3
Answer: 11 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 4cm
Answer: 25.13cm -
4. Ratio Percentage multipliers
What multiplier represents a 19% decrease?
Answer: 0.81 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 31, 23, 17, 25
Answer: Mean = 26.6, Median = 25, Range = 20