Keystones — Capstone
Five GCSE retrieval questions · 25 May 2026 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 51°
Answer: 131.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 11, 25, 91, 51, 84, 11, 20, 66
Answer: Mean = 42.8, Median = 26, Range = 80