Keystones — Lintel
Five GCSE retrieval questions · 10 August 2026 · mathsvault.uk/keystones
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1. Number Error intervals
85 is rounded to the nearest integer. What is the error interval?
Answer: 84.5 ≤ x < 85.5 -
2. Algebra Expanding two brackets
Expand: (x - 4)(x - 7)
Answer: x² - 11x + 28 -
3. Geometry Area of a circle
A circle has area 254.5cm². Find its radius (dp)
Answer: 9cm -
4. Ratio One amount as a percentage of another
Express 63 as a percentage of 173
Answer: 36.42% -
5. Statistics Averages and range
Find the mean, median and range of: 86, 63, 39, 32, 31, 30, 41
Answer: Mean = 46, Median = 39, Range = 56