Keystones — Lintel
Five GCSE retrieval questions · 2 October 2026 · mathsvault.uk/keystones
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1. Number Error intervals
67 is rounded to the nearest integer. What is the error interval?
Answer: 66.5 ≤ x < 67.5 -
2. Algebra Expanding two brackets
Expand: (x + 8)(x - 3)
Answer: x² + 5x - 24 -
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
55 out of 78 students passed. What percentage passed?
Answer: 70.5% -
5. Statistics Averages and range
Find the mean, median and range of: 95, 21, 28, 11, 59, 100, 24, 78
Answer: Mean = 52, Median = 59, Range = 89