Keystones — Lintel
Five GCSE retrieval questions · 11 August 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 79.4 (to dp). State the error interval
Answer: 79.35 ≤ x < 79.45 -
2. Algebra Expanding two brackets
Expand: (x + 4)(x - 3)
Answer: x² + x - 12 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 14cm
Answer: 153.94cm² -
4. Ratio One amount as a percentage of another
Express 56 as a percentage of 140
Answer: 40% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 24, 24, 35, 19, 39
Answer: Mean = 28.2, Mode = 24, Median = 24, Range = 20