Keystones — Cornerstone
Five GCSE retrieval questions · 8 February 2026 · mathsvault.uk/keystones
-
1. Number Highest common factor
Find the HCF of 16 and 28
Answer: 4 -
2. Algebra Substitution
If x = 5, calculate x² + 5x + 2
Answer: 52 -
3. Geometry Circumference of a circle
Calculate the circumference of a circle with radius 6cm
Answer: 37.7cm -
4. Ratio Percentage multipliers
What multiplier represents a 20% increase?
Answer: 1.2 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 17, 32, 49, 16, 32
Answer: Mean = 29.2, Mode = 32, Median = 32, Range = 33