Keystones — Cornerstone
Five GCSE retrieval questions · 5 February 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 16 and 24
Answer: 4 -
2. Algebra Substitution
If x = 3, find the value of 8x + 11
Answer: 35 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 20cm
Answer: 62.83cm -
4. Ratio Percentage multipliers
What multiplier represents a 50% increase?
Answer: 1.5 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 22, 24, 10, 31
Answer: Mean = 23.6, Median = 24, Range = 21