Keystones — Lintel
Five GCSE retrieval questions · 30 September 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 29.6 (to dp). State the error interval
Answer: 29.55 ≤ x < 29.65 -
2. Algebra Expanding two brackets
Expand: (x + 8)(x - 8)
Answer: x² + 0x - 64 -
3. Geometry Area of a circle
A circle has area 314.2cm². Find its radius (dp)
Answer: 10cm -
4. Ratio One amount as a percentage of another
47 out of 76 students passed. What percentage passed?
Answer: 61.8% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 32, 45, 10, 30, 32
Answer: Mean = 29.8, Mode = 32, Median = 32, Range = 35