Keystones — Lintel
Five GCSE retrieval questions · 30 January 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 74.8 (to dp). State the error interval
Answer: 74.75 ≤ x < 74.85 -
2. Algebra Expanding two brackets
Expand: (x + 7)(x - 8)
Answer: x² -x - 56 -
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
52 out of 80 students passed. What percentage passed?
Answer: 65% -
5. Statistics Averages and range
Find the mean, median and range of: 39, 98, 61, 32, 77, 18, 86, 66, 48
Answer: Mean = 58.3, Median = 61, Range = 80