Keystones — Cornerstone
Five GCSE retrieval questions · 11 May 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 20 and 30?
Answer: 10 -
2. Algebra Substitution
If x = 9, find the value of 5x + 11
Answer: 56 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 12cm
Answer: 37.7cm -
4. Ratio Percentage multipliers
What multiplier represents a 25% increase?
Answer: 1.25 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 21, 11, 15, 25
Answer: Mean = 22.4, Median = 21, Range = 29