Keystones — Lintel
Five GCSE retrieval questions · 26 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
94 is rounded to the nearest integer. What is the error interval?
Answer: 93.5 ≤ x < 94.5 -
2. Algebra Expanding two brackets
Expand: (x + 6)(x - 2)
Answer: x² + 4x - 12 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 12cm
Answer: 113.cm² -
4. Ratio One amount as a percentage of another
51 out of 100 students passed. What percentage passed?
Answer: 51% -
5. Statistics Averages and range
Find the mean, mode, median and range of: 28, 45, 43, 28, 14
Answer: Mean = 31.6, Mode = 28, Median = 28, Range = 31