Keystones — Capstone
Five GCSE retrieval questions · 28 August 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 77°
Answer: 82.3cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:5. Find a:b:c.
Answer: 6:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 11, 63, 42, 36, 35, 87, 82, 22
Answer: Mean = 43.2, Median = 36, Range = 76