Keystones — Lintel
Five GCSE retrieval questions · 23 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
24 is rounded to the nearest integer. What is the error interval?
Answer: 23.5 ≤ x < 24.5 -
2. Algebra Expanding two brackets
Expand: (x - 5)(x - 5)
Answer: x² - 10x + 25 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 23cm
Answer: 415.48cm² -
4. Ratio One amount as a percentage of another
Express 49 as a percentage of 190
Answer: 25.79% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 25, 46, 23, 22, 25
Answer: Mean = 28.2, Mode = 25, Median = 25, Range = 24