Keystones — Cornerstone
Five GCSE retrieval questions · 17 August 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 = 4, find the value of 3x + 12
Answer: 24 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 9cm
Answer: 28.27cm -
4. Ratio Percentage multipliers
What multiplier represents a 17% decrease?
Answer: 0.83 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 33, 28, 23, 20
Answer: Mean = 27.4, Median = 28, Range = 13