Keystones — Cornerstone
Five GCSE retrieval questions · 4 February 2026 · mathsvault.uk/keystones
-
1. Number Highest common factor
What is the HCF of 12 and 18?
Answer: 6 -
2. Algebra Substitution
If x = 5, calculate x² + 3x + 3
Answer: 43 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 11cm
Answer: 34.56cm -
4. Ratio Percentage multipliers
What multiplier represents a 15% decrease?
Answer: 0.85 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 29, 48, 20, 24, 20
Answer: Mean = 28.2, Mode = 20, Median = 24, Range = 28