Keystones — Cornerstone
Five GCSE retrieval questions · 6 February 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 9 and 15
Answer: 3 -
2. Algebra Substitution
If x = 10, find the value of 2x + 9
Answer: 29 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 19cm
Answer: 59.69cm -
4. Ratio Percentage multipliers
What multiplier represents a 10% increase?
Answer: 1.1 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 17, 30, 16, 34
Answer: Mean = 26.2, Median = 30, Range = 18