Keystones — Cornerstone
Five GCSE retrieval questions · 15 May 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 24 and 21
Answer: 3 -
2. Algebra Substitution
If x = 5, find the value of 2x + 4
Answer: 14 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 6cm
Answer: 37.7cm -
4. Ratio Percentage multipliers
What multiplier represents a 26% decrease?
Answer: 0.74 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 28, 36, 31, 31, 42
Answer: Mean = 33.6, Mode = 31, Median = 31, Range = 14