Keystones — Lintel
Five GCSE retrieval questions · 27 January 2026 · mathsvault.uk/keystones
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1. Number Error intervals
30 is rounded to the nearest integer. What is the error interval?
Answer: 29.5 ≤ x < 30.5 -
2. Algebra Expanding two brackets
Expand: (x + 6)(x - 3)
Answer: x² + 3x - 18 -
3. Geometry Area of a circle
A circle has area 153.9cm². Find its radius (dp)
Answer: 7cm -
4. Ratio One amount as a percentage of another
51 out of 82 students passed. What percentage passed?
Answer: 62.2% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 43, 15, 30, 17, 30
Answer: Mean = 27, Mode = 30, Median = 30, Range = 28