Keystones — Capstone
Five GCSE retrieval questions · 31 January 2020 · 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 + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 68°
Answer: 108.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 87, 16, 28, 79, 18, 88, 90, 99
Answer: Mean = 63.9, Median = 79, Range = 83