Keystones — Lintel
Five GCSE retrieval questions · 15 August 2026 · mathsvault.uk/keystones
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1. Number Error intervals
56 is rounded to the nearest integer. What is the error interval?
Answer: 55.5 ≤ x < 56.5 -
2. Algebra Expanding two brackets
Expand: (x + 3)(x - 2)
Answer: x² + x - 6 -
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
48 out of 99 students passed. What percentage passed?
Answer: 48.5% -
5. Statistics Averages and range
Find the mean, median and range of: 41, 57, 34, 23, 27, 94, 23, 90, 47
Answer: Mean = 48.4, Median = 41, Range = 71