Keystones — Cornerstone
Five GCSE retrieval questions · 21 August 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 6 and 10
Answer: 2 -
2. Algebra Substitution
If x = 4, find the value of 5x + 5
Answer: 25 -
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 25% decrease?
Answer: 0.75 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 22, 37, 34, 38, 34
Answer: Mean = 33, Mode = 34, Median = 34, Range = 16