Keystones — Capstone
Five GCSE retrieval questions · 2 December 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 24cm, angle = 70°
Answer: 214.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:4. Find a:b:c.
Answer: 4:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 75, 93, 93, 39, 20, 27, 92, 92
Answer: Mean = 60.4, Median = 75, Range = 80