Keystones — Cornerstone
Five GCSE retrieval questions · 28 March 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 20 and 30?
Answer: 10 -
2. Algebra Substitution
If x = 8, find the value of 7x + 9
Answer: 65 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 3cm
Answer: 18.85cm -
4. Ratio Percentage multipliers
What multiplier represents a 33% decrease?
Answer: 0.67 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 31, 38, 20, 21
Answer: Mean = 25.2, Median = 21, Range = 22