Keystones — Lintel
Five GCSE retrieval questions · 27 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 43.3 (to dp). State the error interval
Answer: 43.25 ≤ x < 43.35 -
2. Algebra Expanding two brackets
Expand: (x - 4)(x - 7)
Answer: x² - 11x + 28 -
3. Geometry Area of a circle
A circle has area 615.8cm². Find its radius (dp)
Answer: 14cm -
4. Ratio One amount as a percentage of another
47 out of 85 students passed. What percentage passed?
Answer: 55.3% -
5. Statistics Averages and range
Find the mean, median and range of: 30, 23, 18, 39, 78, 30, 62, 34, 81
Answer: Mean = 43.9, Median = 34, Range = 63