Keystones — Lintel
Five GCSE retrieval questions · 1 October 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 57 (to dp). State the error interval
Answer: 56.95 ≤ x < 57.05 -
2. Algebra Expanding two brackets
Expand: (x + 4)(x - 7)
Answer: x² -3x - 28 -
3. Geometry Area of a circle
A circle has area 530.9cm². Find its radius (dp)
Answer: 13cm -
4. Ratio One amount as a percentage of another
53 out of 92 students passed. What percentage passed?
Answer: 57.6% -
5. Statistics Averages and range
Find the mean, median and range of: 49, 27, 80, 74, 25, 25, 37, 46, 91
Answer: Mean = 50.4, Median = 46, Range = 66