Keystones — Capstone
Five GCSE retrieval questions · 9 August 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 49°
Answer: 135.8cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 85, 34, 41, 35, 97, 50
Answer: Mean = 51.1, Median = 41, Range = 81