Keystones — Capstone
Five GCSE retrieval questions · 2 September 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 + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 42°
Answer: 52.2cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 4:3. Find a:b:c.
Answer: 3:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 31, 23, 92, 39, 36, 83, 53, 92
Answer: Mean = 55, Median = 46, Range = 69