Keystones — Cornerstone
Five GCSE retrieval questions · 6 October 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 35 and 25
Answer: 5 -
2. Algebra Substitution
If x = 2, calculate x² + 6x + 7
Answer: 23 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 8cm
Answer: 25.13cm -
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: 21, 17, 37, 29, 21
Answer: Mean = 25, Median = 21, Range = 20