Keystones — Lintel
Five GCSE retrieval questions · 7 May 2026 · mathsvault.uk/keystones
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1. Number Error intervals
95 is rounded to the nearest integer. What is the error interval?
Answer: 94.5 ≤ x < 95.5 -
2. Algebra Expanding two brackets
Expand: (x - 5)(x - 7)
Answer: x² - 12x + 35 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 18cm
Answer: 254.47cm² -
4. Ratio One amount as a percentage of another
Express 49 as a percentage of 208
Answer: 23.56% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 20, 35, 29, 29, 44
Answer: Mean = 31.4, Mode = 29, Median = 29, Range = 24