Keystones — Capstone
Five GCSE retrieval questions · 18 August 2022 · 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 + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 72°
Answer: 125.5cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 83, 38, 29, 86, 70, 85, 12, 91
Answer: Mean = 62.7, Median = 70, Range = 79