Keystones — Capstone
Five GCSE retrieval questions · 3 March 2025 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 63°
Answer: 106cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 30, 83, 50, 55, 97, 24, 37
Answer: Mean = 57.9, Median = 55, Range = 73