Keystones — Capstone
Five GCSE retrieval questions · 29 May 2026 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 79°
Answer: 235.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 64, 74, 72, 88, 32, 87, 85, 21
Answer: Mean = 67.7, Median = 74, Range = 67