Keystones — Capstone
Five GCSE retrieval questions · 28 March 2019 · 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 54°
Answer: 138.3cm² -
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: 92, 44, 93, 46, 81, 100, 86, 69
Answer: Mean = 76.4, Median = 86, Range = 56