Keystones — Cornerstone
Five GCSE retrieval questions · 2 February 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 16 and 20
Answer: 4 -
2. Algebra Substitution
If x = 6, find the value of 8x + 10
Answer: 58 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 15cm
Answer: 47.12cm -
4. Ratio Percentage multipliers
What multiplier represents a 19% decrease?
Answer: 0.81 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 28, 23, 23, 13, 43
Answer: Mean = 26, Mode = 23, Median = 23, Range = 30