Keystones — Lintel
Five GCSE retrieval questions · 5 May 2026 · mathsvault.uk/keystones
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1. Number Error intervals
70 is rounded to the nearest integer. What is the error interval?
Answer: 69.5 ≤ x < 70.5 -
2. Algebra Expanding two brackets
Expand: (x + 2)(x - 5)
Answer: x² -3x - 10 -
3. Geometry Area of a circle
Calculate the area of a circle with diameter 8cm
Answer: 50.27cm² -
4. Ratio One amount as a percentage of another
Express 41 as a percentage of 113
Answer: 36.28% -
5. Statistics Averages and range
Find the mean, median and range of: 43, 26, 35, 72, 77, 57, 93
Answer: Mean = 57.6, Median = 57, Range = 67