Keystones — Lintel
Five GCSE retrieval questions · 6 May 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 52.5 (to dp). State the error interval
Answer: 52.45 ≤ x < 52.55 -
2. Algebra Expanding two brackets
Expand: (x + 3)(x - 7)
Answer: x² -4x - 21 -
3. Geometry Area of a circle
A circle has area 201.cm². Find its radius (dp)
Answer: 8cm -
4. Ratio One amount as a percentage of another
Express 45 as a percentage of 285
Answer: 15.79% -
5. Statistics Averages and range
Find the mean, median and range of: 11, 49, 80, 46, 60, 58, 33, 49
Answer: Mean = 48.3, Median = 49, Range = 69