Keystones — Capstone
Five GCSE retrieval questions · 15 February 2025 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
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 = 26cm, angle = 79°
Answer: 306.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 48, 21, 44, 56, 63, 99, 42, 24
Answer: Mean = 53.6, Median = 48, Range = 78