Keystones — Cornerstone
Five GCSE retrieval questions · 24 March 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 20 and 12
Answer: 4 -
2. Algebra Substitution
If x = 4, find the value of 3x + 12
Answer: 24 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 8cm
Answer: 50.27cm -
4. Ratio Percentage multipliers
What multiplier represents a 36% decrease?
Answer: 0.64 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 33, 31, 23, 24
Answer: Mean = 24.2, Median = 24, Range = 23