Keystones — Lintel
Five GCSE retrieval questions · 29 September 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 63.2 (to dp). State the error interval
Answer: 63.15 ≤ x < 63.25 -
2. Algebra Expanding two brackets
Expand: (x + 6)(x - 4)
Answer: x² + 2x - 24 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 9cm
Answer: 63.62cm² -
4. Ratio One amount as a percentage of another
47 out of 95 students passed. What percentage passed?
Answer: 49.5% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 35, 35, 16, 12, 33
Answer: Mean = 26.2, Mode = 35, Median = 33, Range = 23