Keystones — Capstone
Five GCSE retrieval questions · 23 October 2026 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 51°
Answer: 141.4cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 53, 29, 62, 96, 60, 38, 86
Answer: Mean = 60.8, Median = 62, Range = 67