Keystones — Cornerstone
Five GCSE retrieval questions · 12 May 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 40 and 35
Answer: 5 -
2. Algebra Substitution
If x = 7, find the value of 3x + 11
Answer: 32 -
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 10% increase?
Answer: 1.1 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 30, 32, 20, 27
Answer: Mean = 25.6, Median = 27, Range = 13