Keystones — Cornerstone
Five GCSE retrieval questions · 1 July 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
Find the HCF of 32 and 28
Answer: 4 -
2. Algebra Substitution
If x = 7, find the value of 3x + 8
Answer: 29 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 10cm
Answer: 62.83cm -
4. Ratio Percentage multipliers
What multiplier represents a 39% decrease?
Answer: 0.61 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 15, 29, 38, 18
Answer: Mean = 25.8, Median = 29, Range = 23