Keystones — Lintel
Five GCSE retrieval questions · 8 May 2026 · mathsvault.uk/keystones
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1. Number Error intervals
73 is rounded to the nearest integer. What is the error interval?
Answer: 72.5 ≤ x < 73.5 -
2. Algebra Expanding two brackets
Expand: (x - 3)(x - 3)
Answer: x² - 6x + 9 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 20cm
Answer: 314.16cm² -
4. Ratio One amount as a percentage of another
Express 50 as a percentage of 271
Answer: 18.45% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 35, 12, 34, 40, 34
Answer: Mean = 31, Mode = 34, Median = 34, Range = 28