Keystones — Lintel
Five GCSE retrieval questions · 28 September 2026 · mathsvault.uk/keystones
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1. Number Error intervals
88 is rounded to the nearest integer. What is the error interval?
Answer: 87.5 ≤ x < 88.5 -
2. Algebra Expanding two brackets
Expand: (x - 5)(x - 2)
Answer: x² - 7x + 10 -
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
52 out of 77 students passed. What percentage passed?
Answer: 67.5% -
5. Statistics Averages and range
Find the mean, median and range of: 58, 95, 46, 59, 66, 79, 99
Answer: Mean = 71.7, Median = 66, Range = 53