Keystones — Cornerstone
Five GCSE retrieval questions · 8 October 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 30 and 45?
Answer: 15 -
2. Algebra Substitution
If x = 3, find the value of 2x + 8
Answer: 14 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 3cm
Answer: 18.85cm -
4. Ratio Percentage multipliers
What multiplier represents a 35% decrease?
Answer: 0.65 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 45, 20, 20, 22, 47
Answer: Mean = 30.8, Mode = 20, Median = 22, Range = 27