Keystones — Lintel
Five GCSE retrieval questions · 12 August 2026 · mathsvault.uk/keystones
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1. Number Error intervals
96 is rounded to the nearest integer. What is the error interval?
Answer: 95.5 ≤ x < 96.5 -
2. Algebra Expanding two brackets
Expand: (x + 8)(x - 6)
Answer: x² + 2x - 48 -
3. Geometry Area of a circle
A circle has area 78.5cm². Find its radius (dp)
Answer: 5cm -
4. Ratio One amount as a percentage of another
Express 39 as a percentage of 130
Answer: 30% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 20, 20, 35, 48, 26
Answer: Mean = 29.8, Mode = 20, Median = 26, Range = 28