Keystones — Capstone
Five GCSE retrieval questions · 14 March 2025 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 18cm, b = 20cm, angle = 54°
Answer: 145.6cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 4:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 84, 14, 15, 54, 89, 43, 87, 87
Answer: Mean = 60.8, Median = 74, Range = 75