Keystones — Cornerstone
Five GCSE retrieval questions · 25 March 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 30 and 45?
Answer: 15 -
2. Algebra Substitution
If x = 3, calculate x² + 3x + 8
Answer: 26 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 7cm
Answer: 43.98cm -
4. Ratio Percentage multipliers
What multiplier represents a 17% decrease?
Answer: 0.83 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 29, 26, 21, 30, 26
Answer: Mean = 26.4, Mode = 26, Median = 26, Range = 9