Keystones — Lintel
Five GCSE retrieval questions · 24 June 2026 · mathsvault.uk/keystones
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1. Number Error intervals
75 is rounded to the nearest integer. What is the error interval?
Answer: 74.5 ≤ x < 75.5 -
2. Algebra Expanding two brackets
Expand: (x - 6)(x - 2)
Answer: x² - 8x + 12 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 17cm
Answer: 226.98cm² -
4. Ratio One amount as a percentage of another
52 out of 89 students passed. What percentage passed?
Answer: 58.4% -
5. Statistics Averages and range
Find the mean, median and range of: 25, 41, 73, 16, 84, 17, 85, 15, 77
Answer: Mean = 48.1, Median = 41, Range = 70