Keystones — Lintel
Five GCSE retrieval questions · 25 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 26.9 (to dp). State the error interval
Answer: 26.85 ≤ x < 26.95 -
2. Algebra Expanding two brackets
Expand: (x + 4)(x - 8)
Answer: x² -4x - 32 -
3. Geometry Area of a circle
A circle has area 452.4cm². Find its radius (dp)
Answer: 12cm -
4. Ratio One amount as a percentage of another
53 out of 71 students passed. What percentage passed?
Answer: 74.6% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 38, 36, 45, 36, 22
Answer: Mean = 35.4, Mode = 36, Median = 36, Range = 23