Keystones — Capstone
Five GCSE retrieval questions · 11 January 2023 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 69°
Answer: 112cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:5. Find a:b:c.
Answer: 2:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 96, 43, 63, 15, 25, 41, 83
Answer: Mean = 49.9, Median = 43, Range = 81