Keystones — Lintel
Five GCSE retrieval questions · 28 January 2026 · mathsvault.uk/keystones
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1. Number Error intervals
84 is rounded to the nearest integer. What is the error interval?
Answer: 83.5 ≤ x < 84.5 -
2. Algebra Expanding two brackets
Expand: (x + 7)(x - 6)
Answer: x² + x - 42 -
3. Geometry Area of a circle
A circle has area 314.2cm². Find its radius (dp)
Answer: 10cm -
4. Ratio One amount as a percentage of another
46 out of 70 students passed. What percentage passed?
Answer: 65.7% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 15, 36, 36, 16, 39
Answer: Mean = 28.4, Mode = 36, Median = 36, Range = 24