Keystones — Cornerstone
Five GCSE retrieval questions · 16 May 2026 · mathsvault.uk/keystones
-
1. Number Highest common factor
Find the HCF of 20 and 20
Answer: 4 -
2. Algebra Substitution
If x = 10, find the value of 3x + 11
Answer: 41 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 13cm
Answer: 40.84cm -
4. Ratio Percentage multipliers
What multiplier represents a 18% decrease?
Answer: 0.82 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 15, 38, 38, 38, 47
Answer: Mean = 35.2, Mode = 38, Median = 38, Range = 32