Keystones — Cornerstone
Five GCSE retrieval questions · 5 July 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 12 and 18?
Answer: 6 -
2. Algebra Substitution
If x = 5, find the value of 2x + 6
Answer: 16 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 13cm
Answer: 40.84cm -
4. Ratio Percentage multipliers
What multiplier represents a 25% increase?
Answer: 1.25 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 24, 15, 39, 36, 36
Answer: Mean = 30, Mode = 36, Median = 36, Range = 24