Keystones — Lintel
Five GCSE retrieval questions · 17 March 2026 · mathsvault.uk/keystones
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1. Number Error intervals
30 is rounded to the nearest integer. What is the error interval?
Answer: 29.5 ≤ x < 30.5 -
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 15cm
Answer: 176.71cm² -
4. Ratio One amount as a percentage of another
Express 66 as a percentage of 102
Answer: 64.71% -
5. Statistics Averages and range
Find the mean, median and range of: 65, 83, 93, 34, 66, 68, 14
Answer: Mean = 60.4, Median = 66, Range = 79