Keystones — Cornerstone
Five GCSE retrieval questions · 29 October 2026 · mathsvault.uk/keystones
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1. Number Directed number mixed operations
Calculate: -1 + 4 - 5
Answer: -2 -
2. Algebra Linear nth term
Find the nth term: 25, 21, 17, 13, ...
Answer: 29 - 4n -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 9cm
Answer: 63.62cm² -
4. Ratio Percentage change
A price falls from £486.00 to £133.00. Calculate the percentage decrease
Answer: 72.6% -
5. Statistics Median
Find the median of: 10, 14, 6, 18, 18
Answer: 14