Keystones — Cornerstone
Five GCSE retrieval questions · 27 March 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 = 8, find the value of 8x + 3
Answer: 67 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 5cm
Answer: 31.42cm -
4. Ratio Percentage multipliers
What multiplier represents a 22% decrease?
Answer: 0.78 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 32, 30, 32, 18
Answer: Mean = 25.4, Median = 30, Range = 17