Keystones — Capstone
Five GCSE retrieval questions · 26 November 2018 · 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 15cm, angle = 51°
Answer: 151.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 65, 82, 50, 33, 83, 25, 56, 85
Answer: Mean = 63.6, Median = 65, Range = 68