Keystones — Lintel
Five GCSE retrieval questions · 20 March 2026 · mathsvault.uk/keystones
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1. Number Error intervals
25 is rounded to the nearest integer. What is the error interval?
Answer: 24.5 ≤ x < 25.5 -
2. Algebra Expanding two brackets
Expand: (x - 4)(x - 3)
Answer: x² - 7x + 12 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 19cm
Answer: 283.53cm² -
4. Ratio One amount as a percentage of another
Express 69 as a percentage of 186
Answer: 37.1% -
5. Statistics Averages and range
Find the mean, median and range of: 58, 62, 24, 73, 74, 10, 90, 63
Answer: Mean = 56.8, Median = 63, Range = 80