Keystones — Capstone
Five GCSE retrieval questions · 13 July 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 61°
Answer: 244.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:3. Find a:b:c.
Answer: 2:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 92, 88, 81, 37, 54, 57
Answer: Mean = 65.4, Median = 57, Range = 55