Keystones — Capstone
Five GCSE retrieval questions · 16 April 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 + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 69°
Answer: 221.7cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 38, 32, 77, 15, 36, 28
Answer: Mean = 45.9, Median = 36, Range = 80