Keystones — Lintel
Five GCSE retrieval questions · 14 August 2026 · mathsvault.uk/keystones
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1. Number Error intervals
A value is 88.3 (to dp). State the error interval
Answer: 88.25 ≤ x < 88.35 -
2. Algebra Expanding two brackets
Expand: (x - 3)(x - 5)
Answer: x² - 8x + 15 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 9cm
Answer: 63.62cm² -
4. Ratio One amount as a percentage of another
47 out of 97 students passed. What percentage passed?
Answer: 48.5% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 25, 24, 14, 24, 32
Answer: Mean = 23.8, Mode = 24, Median = 24, Range = 18