Keystones — Cornerstone
Five GCSE retrieval questions · 11 October 2026
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1. Number Highest common factor
What is the HCF of 20 and 30?
Answer: 10 -
2. Algebra Substitution
If x = 5, find the value of 3x + 12
Answer: 27 -
3. Geometry Circumference of a circle
Find the circumference of a circle with diameter 10cm
Answer: 31.42cm -
4. Ratio Percentage multipliers
What multiplier represents a 25% increase?
Answer: 1.25 -
5. Statistics Averages and range
Find the mean, mode, median and range of: 29, 14, 42, 33, 29
Answer: Mean = 29.4, Mode = 29, Median = 29, Range = 28