Keystones — Cornerstone
Five GCSE retrieval questions · 7 October 2026 · mathsvault.uk/keystones
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1. Number Highest common factor
What is the HCF of 24 and 36?
Answer: 12 -
2. Algebra Substitution
If x = 2, find the value of 6x + 3
Answer: 15 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 15cm
Answer: 94.25cm -
4. Ratio Percentage multipliers
What multiplier represents a 33% decrease?
Answer: 0.67 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 30, 29, 37, 29, 20
Answer: Mean = 29, Mode = 29, Median = 29, Range = 17